Source code for scrolllockicon.cs

```
using System.Linq;
```
```
 
```
```
namespace RobvanderWoude
```
```
{
```

	public partial class ScrollLockIcon : System.Windows.Forms.Form

```
	{
```
```
		static string progver = "1.00";
```

		static string copyrightsyear = "2021";

```
 
```
```
 
```
```
		#region Global Variables
```
```
 
```

		private System.Windows.Forms.NotifyIcon scrolllockicon;

		private System.Windows.Forms.ContextMenu contextmenu;

		private System.Windows.Forms.MenuItem menuitemexit;

		private System.Windows.Forms.MenuItem menuitemsettings;

		private System.Windows.Forms.Form formsettings;

		private System.Windows.Forms.TextBox textbox;

		private System.Windows.Forms.ComboBox dropdowncoloroff;

		private System.Windows.Forms.ComboBox dropdowncoloron;

		private System.Windows.Forms.CheckBox checkboxflashwhenoff;

		private System.Windows.Forms.CheckBox checkboxflashwhenon;

		private System.Windows.Forms.CheckBox checkboxhidewhenoff;

		private System.Collections.Generic.List<System.Drawing.Icon> iconsoff;

		private System.Collections.Generic.List<System.Drawing.Icon> iconson;

		private System.Windows.Forms.Timer timer;

		private readonly System.Drawing.Brush black = System.Drawing.Brushes.Black;

```
		private bool scrolllock;
```
```
 
```
```
		#endregion Global Variables
```
```
 
```
```
 
```
```
		/// <summary>
```

		/// The main entry point for the application.

```
		/// </summary>
```
```
		[System.STAThread]
```
```
		static void Main( )
```
```
		{
```

			System.Windows.Forms.Application.EnableVisualStyles( );

			System.Windows.Forms.Application.SetCompatibleTextRenderingDefault( false );

			System.Windows.Forms.Application.Run( new ScrollLockIcon( ) );

```
		}
```
```
 
```
```
 
```
```
		public ScrollLockIcon( )
```
```
		{
```
```
			ReadSettings( );
```

			scrolllockicon = new System.Windows.Forms.NotifyIcon( );

			// Determine which icon should be displayed

			iconsoff = new System.Collections.Generic.List<System.Drawing.Icon>( ) { CreateIcon( GlobalSettings.IndicatorText, black, GlobalSettings.IndicatorColorOFF ), CreateIcon( GlobalSettings.IndicatorText, GlobalSettings.IndicatorColorOFF, black ) };

			iconson = new System.Collections.Generic.List<System.Drawing.Icon>( ) { CreateIcon( GlobalSettings.IndicatorText, black, GlobalSettings.IndicatorColorON ), CreateIcon( GlobalSettings.IndicatorText, GlobalSettings.IndicatorColorON, black ) };

			scrolllock = System.Windows.Forms.Control.IsKeyLocked( System.Windows.Forms.Keys.Scroll );

			this.scrolllockicon.Icon = iconson[0];

```
			// Context Menu
```

			this.contextmenu = new System.Windows.Forms.ContextMenu( );

```
			// Context Menu: Settings
```

			this.menuitemsettings = new System.Windows.Forms.MenuItem( "&Settings", new System.EventHandler( MenuItemSettings_Click ) );

			this.contextmenu.MenuItems.Add( menuitemsettings );

```
			// Context Menu: Exit
```

			this.menuitemexit = new System.Windows.Forms.MenuItem( "E&xit", new System.EventHandler( MenuItemExit_Click ) );

			this.contextmenu.MenuItems.Add( menuitemexit );

			this.scrolllockicon.ContextMenu = this.contextmenu;

```
			this.scrolllockicon.Visible = true;
```
```
			// Timer for key monitoring interval
```

			this.timer = new System.Windows.Forms.Timer( );

```
			this.timer.Interval = 1000;
```

			this.timer.Tick += new System.EventHandler( Timer_Tick );

```
			this.timer.Start( );
```

			// Store version information in the registry

			if ( ReadRegValue( "Version", string.Empty ) != progver )

```
			{
```

				WriteRegValue( "Version", progver );

				WriteRegValue( "URL", "https://www.robvanderwoude.com/csharpexamples.php#ScrollLockIcon" );

				WriteRegValue( "Requirement", RequiredNetVersion( ) );

```
			}
```
```
		}
```
```
 
```
```
 
```
```
		/// <summary>
```

		/// Code to dynamically generate icons by Joshua Flanagan on CodeProject.com

		/// https://www.codeproject.com/Articles/7122/Dynamically-Generating-Icons-safely

```
		/// </summary>
```

		public System.Drawing.Icon CreateIcon( string text, System.Drawing.Brush fgcolor, System.Drawing.Brush bgcolor )

```
		{
```
```
			System.Drawing.Icon icon = null;
```

			System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap( 16, 16 );

			System.Drawing.Font font = new System.Drawing.Font( System.Drawing.FontFamily.GenericSansSerif, 8F, System.Drawing.FontStyle.Bold );

			using ( System.Drawing.Graphics graphic = System.Drawing.Graphics.FromImage( bitmap ) )

```
			{
```

				graphic.FillEllipse( bgcolor, 0, 0, 16, 16 );

				System.Drawing.SizeF textsize = graphic.MeasureString( text, font );

				System.Single x = System.Convert.ToSingle( System.Math.Floor( ( bitmap.Width - textsize.Width ) / 2 ) );

				System.Single y = System.Convert.ToSingle( System.Math.Ceiling( ( bitmap.Height - textsize.Height ) / 2 ) );

				graphic.DrawString( text, font, fgcolor, x, y, System.Drawing.StringFormat.GenericDefault );

				icon = System.Drawing.Icon.FromHandle( bitmap.GetHicon( ) );

```
			}
```
```
			return icon;
```
```
		}
```
```
 
```
```
 
```

		public System.Drawing.Size GetTextSize( string text )

```
		{
```

			return System.Windows.Forms.TextRenderer.MeasureText( text, formsettings.Font );

```
 
```
```
		}
```
```
 
```
```
 
```
```
		public void OpenURL( string url )
```
```
		{
```

			System.Diagnostics.ProcessStartInfo startinfo = new System.Diagnostics.ProcessStartInfo( url );

			System.Diagnostics.Process.Start( startinfo );

```
		}
```
```
 
```
```
 
```
```
		public void Quit( )
```
```
		{
```
```
			this.timer.Stop( );
```
```
			this.timer.Dispose( );
```
```
			this.scrolllockicon.Visible = false;
```
```
			this.scrolllockicon.Dispose( );
```

			System.Windows.Forms.Application.Exit( );

```
		}
```
```
 
```
```
 
```
```
		public void ReadSettings( )
```
```
		{
```

			GlobalSettings.FlashIfOFF = ReadRegValue( "FlashIfOFF", GlobalSettings.FlashIfOFF );

			GlobalSettings.FlashIfON = ReadRegValue( "FlashIfON", GlobalSettings.FlashIfON );

			GlobalSettings.HideIfOFF = ReadRegValue( "HideIfOFF", GlobalSettings.HideIfOFF );

			string currentcolor = GlobalSettings.Colors.Where( c => c.Value.Equals( GlobalSettings.IndicatorColorOFF ) ).First( ).Key; // requires System.Linq

			GlobalSettings.IndicatorColorOFF = GlobalSettings.Colors[ReadRegValue( "IndicatorColorOFF", currentcolor )];

			currentcolor = GlobalSettings.Colors.Where( c => c.Value.Equals( GlobalSettings.IndicatorColorON ) ).First( ).Key; // requires System.Linq

			GlobalSettings.IndicatorColorON = GlobalSettings.Colors[ReadRegValue( "IndicatorColorON", currentcolor )];

			GlobalSettings.IndicatorText = ReadRegValue( "IndicatorText", GlobalSettings.IndicatorText );

```
		}
```
```
 
```
```
 
```
```
		/// <summary>
```

		/// Code to get the required .NET Framework version by Fernando Gonzalez Sanchez on StackOverflow.com

		/// https://stackoverflow.com/a/18623516

```
		/// </summary>
```
```
		static string RequiredNetVersion( )
```
```
		{
```

			object[] list = System.Reflection.Assembly.GetExecutingAssembly( ).GetCustomAttributes( true );

			var attribute = list.OfType<System.Runtime.Versioning.TargetFrameworkAttribute>( ).First( ); // requires Linq

			string frameworkname = attribute.FrameworkName;

			string frameworkdisplayname = attribute.FrameworkDisplayName;

```
			return frameworkdisplayname;
```
```
		}
```
```
 
```
```
 
```
```
		public void SaveSettings( )
```
```
		{
```
```
			// Adjust global settings
```

			GlobalSettings.FlashIfOFF = checkboxflashwhenoff.Checked && !checkboxhidewhenoff.Checked;

			GlobalSettings.FlashIfON = checkboxflashwhenon.Checked;

			GlobalSettings.HideIfOFF = checkboxhidewhenoff.Checked;

			GlobalSettings.IndicatorColorOFF = GlobalSettings.Colors[dropdowncoloroff.Text];

			GlobalSettings.IndicatorColorON = GlobalSettings.Colors[dropdowncoloron.Text];

			if ( !string.IsNullOrWhiteSpace( textbox.Text ) )

```
			{
```

				GlobalSettings.IndicatorText = textbox.Text.Trim( );

```
			}
```
```
			// Update program status
```

			iconsoff = new System.Collections.Generic.List<System.Drawing.Icon>( ) { CreateIcon( GlobalSettings.IndicatorText, black, GlobalSettings.IndicatorColorOFF ), CreateIcon( GlobalSettings.IndicatorText, GlobalSettings.IndicatorColorOFF, black ) };

			iconson = new System.Collections.Generic.List<System.Drawing.Icon>( ) { CreateIcon( GlobalSettings.IndicatorText, black, GlobalSettings.IndicatorColorON ), CreateIcon( GlobalSettings.IndicatorText, GlobalSettings.IndicatorColorON, black ) };

```
			// Save settings to registry
```
```
			bool success = true;
```

			success = success && WriteRegValue( "FlashIfOFF", GlobalSettings.FlashIfOFF );

			success = success && WriteRegValue( "FlashIfON", GlobalSettings.FlashIfON );

			success = success && WriteRegValue( "HideIfOFF", GlobalSettings.HideIfOFF );

			success = success && WriteRegValue( "IndicatorColorOFF", GlobalSettings.Colors.Where( c => c.Value.Equals( GlobalSettings.IndicatorColorOFF ) ).First( ).Key );

			success = success && WriteRegValue( "IndicatorColorON", GlobalSettings.Colors.Where( c => c.Value.Equals( GlobalSettings.IndicatorColorON ) ).First( ).Key );

			success = success && WriteRegValue( "IndicatorText", GlobalSettings.IndicatorText );

```
			if ( success )
```
```
			{
```

				System.Windows.Forms.MessageBox.Show( "Settings were successfully stored in the registry", "Settings Saved", System.Windows.Forms.MessageBoxButtons.OK, System.Windows.Forms.MessageBoxIcon.Information );

```
			}
```
```
			else
```
```
			{
```

				System.Windows.Forms.MessageBox.Show( "Unable to store the settings in the registry", "Error Saving Settings", System.Windows.Forms.MessageBoxButtons.OK, System.Windows.Forms.MessageBoxIcon.Error );

```
			}
```
```
			// Close settings window
```
```
			formsettings.Close( );
```
```
		}
```
```
 
```
```
 
```
```
		public void Settings( )
```
```
		{
```
```
			ReadSettings( );
```
```
 
```
```
			System.Int32 column1width = 0;
```
```
			System.Int32 column2width = 0;
```
```
			System.Int32 rowheight = 30;
```
```
 
```

			formsettings = new System.Windows.Forms.Form( );

			formsettings.Text = string.Format( "ScrollLockIcon {0} Settings \u00A9 {1} Rob van der Woude", progver, copyrightsyear );

			formsettings.Size = new System.Drawing.Size( 500, 425 );

			formsettings.Font = new System.Drawing.Font( System.Drawing.FontFamily.GenericSansSerif, 10F );

```
 
```
```
			// Column 1 Row 1
```

			System.Windows.Forms.Label labeltext = new System.Windows.Forms.Label( );

```
			labeltext.Text = "Indicator text";
```

			column1width = System.Math.Max( column1width, GetTextSize( labeltext.Text ).Width );

			labeltext.Location = new System.Drawing.Point( 20, 20 );

			formsettings.Controls.Add( labeltext );

```
 
```
```
			// Column 1 Row 2
```

			System.Windows.Forms.Label labelcoloroff = new System.Windows.Forms.Label( );

			labelcoloroff.Text = "Indicator color when OFF";

```
			labelcoloroff.AutoSize = true;
```

			column1width = System.Math.Max( column1width, GetTextSize( labelcoloroff.Text ).Width );

			labelcoloroff.Location = new System.Drawing.Point( labeltext.Location.X, labeltext.Location.Y + labeltext.Height + rowheight );

			formsettings.Controls.Add( labelcoloroff );

```
 
```
```
			// Column 1 Row 3
```

			System.Windows.Forms.Label labelcoloron = new System.Windows.Forms.Label( );

			labelcoloron.Text = "Indicator color when ON";

```
			labelcoloron.AutoSize = true;
```

			column1width = System.Math.Max( column1width, GetTextSize( labelcoloron.Text ).Width );

			labelcoloron.Location = new System.Drawing.Point( labelcoloroff.Location.X, labelcoloroff.Location.Y + labelcoloroff.Height + rowheight );

			formsettings.Controls.Add( labelcoloron );

```
 
```
```
			// Column 2 Row 1
```

			textbox = new System.Windows.Forms.TextBox( );

			textbox.Text = GlobalSettings.IndicatorText;

```
			textbox.MaxLength = 2;
```

			textbox.SelectionStart = textbox.Text.Length;

```
			textbox.SelectionLength = 0;
```

			column2width = System.Math.Max( column2width, textbox.Width );

			textbox.Location = new System.Drawing.Point( column1width + 30, labeltext.Location.Y );

			formsettings.Controls.Add( textbox );

```
 
```
```
			// Column 2 Row 2
```

			dropdowncoloroff = new System.Windows.Forms.ComboBox( );

```
			ComboboxItem item;
```

			foreach ( string color in GlobalSettings.Colors.Keys )

```
			{
```
```
				item = new ComboboxItem( );
```
```
				item.Text = color;
```

				item.Value = GlobalSettings.Colors[color];

```
				dropdowncoloroff.Items.Add( item );
```
```
			}
```

			dropdowncoloroff.SelectedIndex = GlobalSettings.Colors.Values.ToList<System.Drawing.Brush>( ).IndexOf( GlobalSettings.IndicatorColorOFF ); // requires System.Linq

			column2width = System.Math.Max( column2width, dropdowncoloroff.Width );

			dropdowncoloroff.Enabled = !GlobalSettings.HideIfOFF;

			dropdowncoloroff.Location = new System.Drawing.Point( column1width + 30, labelcoloroff.Location.Y );

			formsettings.Controls.Add( dropdowncoloroff );

```
 
```
```
			// Column 2 Row 3
```

			dropdowncoloron = new System.Windows.Forms.ComboBox( );

			foreach ( string color in GlobalSettings.Colors.Keys )

```
			{
```
```
				item = new ComboboxItem( );
```
```
				item.Text = color;
```

				item.Value = GlobalSettings.Colors[color];

```
				dropdowncoloron.Items.Add( item );
```
```
			}
```

			dropdowncoloron.SelectedIndex = GlobalSettings.Colors.Values.ToList<System.Drawing.Brush>( ).IndexOf( GlobalSettings.IndicatorColorON ); // requires System.Linq

			column2width = System.Math.Max( column2width, dropdowncoloron.Width );

			dropdowncoloron.Location = new System.Drawing.Point( column1width + 30, labelcoloron.Location.Y );

			formsettings.Controls.Add( dropdowncoloron );

```
 
```
```
			// Column 3 Row 1
```

			checkboxhidewhenoff = new System.Windows.Forms.CheckBox( );

			checkboxhidewhenoff.Text = " Hide when OFF";

```
			checkboxhidewhenoff.AutoSize = true;
```

			checkboxhidewhenoff.Checked = GlobalSettings.HideIfOFF;

			checkboxhidewhenoff.Location = new System.Drawing.Point( column1width + column2width + 50, textbox.Location.Y );

			checkboxhidewhenoff.Click += Checkboxhidewhenoff_Click;

			checkboxhidewhenoff.KeyPress += Checkboxhidewhenoff_KeyPress;

			formsettings.Controls.Add( checkboxhidewhenoff );

```
 
```
```
			// Column 3 Row 2
```

			checkboxflashwhenoff = new System.Windows.Forms.CheckBox( );

			checkboxflashwhenoff.Text = " Flash when OFF";

			checkboxflashwhenoff.AutoSize = true;

			checkboxflashwhenoff.Checked = GlobalSettings.FlashIfOFF && !GlobalSettings.HideIfOFF;

			checkboxflashwhenoff.Enabled = !GlobalSettings.HideIfOFF;

			checkboxflashwhenoff.Location = new System.Drawing.Point( column1width + column2width + 50, dropdowncoloroff.Location.Y );

			formsettings.Controls.Add( checkboxflashwhenoff );

```
 
```
```
			// Column 3 Row 3
```

			checkboxflashwhenon = new System.Windows.Forms.CheckBox( );

			checkboxflashwhenon.Text = " Flash when ON";

```
			checkboxflashwhenon.AutoSize = true;
```

			checkboxflashwhenon.Checked = GlobalSettings.FlashIfON;

			checkboxflashwhenon.Location = new System.Drawing.Point( column1width + column2width + 50, dropdowncoloron.Location.Y );

			formsettings.Controls.Add( checkboxflashwhenon );

```
 
```
```
			// Buttons
```

			System.Windows.Forms.Button buttonsave = new System.Windows.Forms.Button( );

```
			buttonsave.Text = "Save";
```

			buttonsave.Click += new System.EventHandler( ButtonSave_Click );

			buttonsave.Size = new System.Drawing.Size( 100, 32 );

			buttonsave.Location = new System.Drawing.Point( formsettings.ClientSize.Width / 2 - buttonsave.Width - 20, labelcoloron.Location.Y + 2 * rowheight );

			formsettings.Controls.Add( buttonsave );

```
 
```

			System.Windows.Forms.Button buttoncancel = new System.Windows.Forms.Button( );

```
			buttoncancel.Text = "Cancel";
```

			buttoncancel.Click += new System.EventHandler( ButtonCancel_Click );

			buttoncancel.Size = new System.Drawing.Size( 100, 32 );

			buttoncancel.Location = new System.Drawing.Point( formsettings.ClientSize.Width / 2 + 20, buttonsave.Location.Y );

			formsettings.Controls.Add( buttoncancel );

```
 
```
```
			// URLs
```

			System.Windows.Forms.Label labelurlrvdw = new System.Windows.Forms.Label( );

			labelurlrvdw.Text = "Written by Rob van der Woude\nhttps://www.robvanderwoude.com";

			labelurlrvdw.Click += new System.EventHandler( LabelUrlRvdw_Click );

```
			labelurlrvdw.AutoSize = true;
```

			labelurlrvdw.Location = new System.Drawing.Point( 20, buttonsave.Location.Y + 2 * rowheight );

			formsettings.Controls.Add( labelurlrvdw );

```
 
```

			System.Windows.Forms.Label labelurljficos = new System.Windows.Forms.Label( );

			labelurljficos.Text = "Code to dynamically generate icons by Joshua Flanagan on CodeProject.com\nhttps://www.codeproject.com/Articles/7122/Dynamically-Generating-Icons-safely";

			labelurljficos.Font = new System.Drawing.Font( labelurljficos.Font.FontFamily, labelurljficos.Font.Size * 0.9F, labelurljficos.Font.Style );

			labelurljficos.Click += new System.EventHandler( LabelUrlJfIcos_Click );

```
			labelurljficos.AutoSize = true;
```

			labelurljficos.Location = new System.Drawing.Point( 20, System.Convert.ToInt32( labelurlrvdw.Location.Y + 1.5 * rowheight ) );

			formsettings.Controls.Add( labelurljficos );

```
 
```

			System.Windows.Forms.Label labelurlchw = new System.Windows.Forms.Label( );

			labelurlchw.Text = "Code to hide main form by Chriz on StackOverflow.com\nhttps://stackoverflow.com/a/11831856";

			labelurlchw.Font = new System.Drawing.Font( labelurlchw.Font.FontFamily, labelurlchw.Font.Size * 0.9F, labelurlchw.Font.Style );

			labelurlchw.Click += new System.EventHandler( LabelUrlChw_Click );

```
			labelurlchw.AutoSize = true;
```

			labelurlchw.Location = new System.Drawing.Point( 20, System.Convert.ToInt32( labelurljficos.Location.Y + 1.1 * rowheight ) );

			formsettings.Controls.Add( labelurlchw );

```
 
```

			System.Windows.Forms.Label labelurlfgs = new System.Windows.Forms.Label( );

			labelurlfgs.Text = "Code to get the required .NET Framework version by Fernando Gonzalez Sanchez\nhttps://stackoverflow.com/a/18623516";

			labelurlfgs.Font = new System.Drawing.Font( labelurlfgs.Font.FontFamily, labelurlfgs.Font.Size * 0.9F, labelurlfgs.Font.Style );

			labelurlfgs.Click += new System.EventHandler( LabelUrlFgs_Click );

```
			labelurlfgs.AutoSize = true;
```

			labelurlfgs.Location = new System.Drawing.Point( 20, System.Convert.ToInt32( labelurlchw.Location.Y + 1.1 * rowheight ) );

			formsettings.Controls.Add( labelurlfgs );

```
 
```
```
			formsettings.Show( );
```
```
		}
```
```
 
```
```
 
```
```
		public void UpdateSettingsUI( )
```
```
		{
```

			dropdowncoloroff.Enabled = !checkboxhidewhenoff.Checked;

			checkboxflashwhenoff.Enabled = !checkboxhidewhenoff.Checked;

			checkboxflashwhenoff.Checked = checkboxflashwhenoff.Checked && !checkboxhidewhenoff.Checked;

```
		}
```
```
 
```
```
 
```
```
		#region Registry
```
```
 
```

		static bool ReadRegValue( string name, bool current )

```
		{
```
```
			bool value = false;
```

			Microsoft.Win32.RegistryKey regkey = null;

```
			try
```
```
			{
```

				regkey = Microsoft.Win32.Registry.CurrentUser.CreateSubKey( "SOFTWARE\\RobvanderWoude\\ScrollLockIcon", Microsoft.Win32.RegistryKeyPermissionCheck.ReadSubTree );

				value = ( regkey.GetValue( name, ( current ? 1 : 0 ) ).ToString( ) == "1" );

```
				regkey.Close( );
```
```
				return value;
```
```
			}
```
```
			catch ( System.Exception )
```
```
			{
```
```
				if ( regkey != null )
```
```
				{
```
```
					regkey.Close( );
```
```
				}
```
```
				return false;
```
```
			}
```
```
		}
```
```
 
```
```
 
```

		static string ReadRegValue( string name, string current )

```
		{
```
```
			string value = current;
```

			Microsoft.Win32.RegistryKey regkey = null;

```
			try
```
```
			{
```

				regkey = Microsoft.Win32.Registry.CurrentUser.CreateSubKey( "SOFTWARE\\RobvanderWoude\\ScrollLockIcon", Microsoft.Win32.RegistryKeyPermissionCheck.ReadSubTree );

				value = regkey.GetValue( name, current ).ToString( );

```
				regkey.Close( );
```
```
			}
```
```
			catch ( System.Exception )
```
```
			{
```
```
				if ( regkey != null )
```
```
				{
```
```
					regkey.Close( );
```
```
				}
```
```
			}
```
```
			return value;
```
```
		}
```
```
 
```
```
 
```

		static bool WriteRegValue( string name, bool value )

```
		{
```

			Microsoft.Win32.RegistryKey regkey = null;

```
			try
```
```
			{
```

				regkey = Microsoft.Win32.Registry.CurrentUser.CreateSubKey( "SOFTWARE\\RobvanderWoude\\ScrollLockIcon", Microsoft.Win32.RegistryKeyPermissionCheck.ReadWriteSubTree );

				regkey.SetValue( name, ( value ? 1 : 0 ), Microsoft.Win32.RegistryValueKind.DWord );

```
				regkey.Close( );
```
```
				return true;
```
```
			}
```
```
			catch ( System.Exception )
```
```
			{
```
```
				if ( regkey != null )
```
```
				{
```
```
					regkey.Close( );
```
```
				}
```
```
				return false;
```
```
			}
```
```
		}
```
```
 
```
```
 
```

		static bool WriteRegValue( string name, string value )

```
		{
```

			Microsoft.Win32.RegistryKey regkey = null;

```
			try
```
```
			{
```

				regkey = Microsoft.Win32.Registry.CurrentUser.CreateSubKey( "SOFTWARE\\RobvanderWoude\\ScrollLockIcon", Microsoft.Win32.RegistryKeyPermissionCheck.ReadWriteSubTree );

				regkey.SetValue( name, value, Microsoft.Win32.RegistryValueKind.String );

```
				regkey.Close( );
```
```
				return true;
```
```
			}
```
```
			catch ( System.Exception )
```
```
			{
```
```
				if ( regkey != null )
```
```
				{
```
```
					regkey.Close( );
```
```
				}
```
```
				return false;
```
```
			}
```
```
		}
```
```
 
```
```
		#endregion Registry
```
```
 
```
```
 
```
```
		#region Event Handlers
```
```
 
```

		private void ButtonCancel_Click( object sender, System.EventArgs e )

```
		{
```
```
			formsettings.Close( );
```
```
		}
```
```
 
```
```
 
```

		private void ButtonSave_Click( object sender, System.EventArgs e )

```
		{
```
```
			SaveSettings( );
```
```
		}
```
```
 
```
```
 
```

		private void Checkboxhidewhenoff_KeyPress( object sender, System.Windows.Forms.KeyPressEventArgs e )

```
		{
```
```
			UpdateSettingsUI( );
```
```
		}
```
```
 
```
```
 
```

		private void Checkboxhidewhenoff_Click( object sender, System.EventArgs e )

```
		{
```
```
			UpdateSettingsUI( );
```
```
		}
```
```
 
```
```
 
```

		private void LabelUrlChw_Click( object sender, System.EventArgs e )

```
		{
```

			OpenURL( "https://stackoverflow.com/a/11831856" );

```
		}
```
```
 
```
```
 
```

		private void LabelUrlFgs_Click( object sender, System.EventArgs e )

```
		{
```

			OpenURL( "https://stackoverflow.com/a/18623516" );

```
		}
```
```
 
```
```
 
```

		private void LabelUrlJfIcos_Click( object sender, System.EventArgs e )

```
		{
```

			OpenURL( "https://www.codeproject.com/Articles/7122/Dynamically-Generating-Icons-safely" );

```
		}
```
```
 
```
```
 
```

		private void LabelUrlRvdw_Click( object sender, System.EventArgs e )

```
		{
```

			OpenURL( "https://www.robvanderwoude.com/" );

```
		}
```
```
 
```
```
 
```

		private void MenuItemExit_Click( System.Object Sender, System.EventArgs e )

```
		{
```
```
			Quit( );
```
```
		}
```
```
 
```
```
 
```

		private void MenuItemSettings_Click( System.Object Sender, System.EventArgs e )

```
		{
```
```
			Settings( );
```
```
		}
```
```
 
```
```
 
```

		private void Timer_Tick( System.Object sender, System.EventArgs e )

```
		{
```

			scrolllock = System.Windows.Forms.Control.IsKeyLocked( System.Windows.Forms.Keys.Scroll );

```
			if ( scrolllock )
```
```
			{
```
```
				this.scrolllockicon.Visible = true;
```
```
				if ( GlobalSettings.FlashIfON )
```
```
				{
```

					if ( this.scrolllockicon.Icon.Equals( iconson[0] ) )

```
					{
```

						this.scrolllockicon.Icon = iconson[1];

```
					}
```
```
					else
```
```
					{
```

						this.scrolllockicon.Icon = iconson[0];

```
					}
```
```
				}
```
```
				else
```
```
				{
```

					this.scrolllockicon.Icon = iconson[0];

```
				}
```
```
			}
```
```
			else
```
```
			{
```
```
				if ( GlobalSettings.HideIfOFF )
```
```
				{
```

					this.scrolllockicon.Visible = false;

```
				}
```
```
				else
```
```
				{
```

					this.scrolllockicon.Visible = true;

```
					if ( GlobalSettings.FlashIfOFF )
```
```
					{
```

						if ( this.scrolllockicon.Icon.Equals( iconsoff[0] ) )

```
						{
```

							this.scrolllockicon.Icon = iconsoff[1];

```
						}
```
```
						else
```
```
						{
```

							this.scrolllockicon.Icon = iconsoff[0];

```
						}
```
```
					}
```
```
					else
```
```
					{
```

						this.scrolllockicon.Icon = iconsoff[0];

```
					}
```
```
				}
```
```
			}
```
```
		}
```
```
 
```
```
		#endregion Event Handlers
```
```
 
```
```
 
```
```
		#region Overrides
```
```
 
```
```
		/// <summary>
```

		/// Code to hide main form by Chriz on StackOverflow.com

		/// https://stackoverflow.com/a/11831856

```
		/// </summary>
```

		protected override void OnLoad( System.EventArgs e )

```
		{
```

			Visible = false; // Hide form window.

			ShowInTaskbar = false; // Remove from taskbar.

```
			Opacity = 0;
```
```
			base.OnLoad( e );
```
```
		}
```
```
 
```
```
 
```

		protected override void OnClosed( System.EventArgs e )

```
		{
```
```
			Quit( );
```
```
			base.OnClosed( e );
```
```
		}
```
```
 
```
```
		#endregion Overrides
```
```
 
```
```
 
```
```
		public static class GlobalSettings
```
```
		{
```

			private static System.Collections.Generic.Dictionary<string, System.Drawing.Brush> _colors = new System.Collections.Generic.Dictionary<string, System.Drawing.Brush>( ) { { "LightCyan", System.Drawing.Brushes.LightCyan }, { "LightGreen", System.Drawing.Brushes.LightGreen }, { "Orange", System.Drawing.Brushes.Orange }, { "Red", System.Drawing.Brushes.Red }, { "Yellow", System.Drawing.Brushes.Yellow } };

			public static System.Collections.Generic.Dictionary<string, System.Drawing.Brush> Colors

```
			{
```
```
				get
```
```
				{
```
```
					return _colors;
```
```
				}
```
```
			}
```
```
 
```

			private static string _indicatortext = "S";

```
			public static string IndicatorText
```
```
			{
```
```
				get
```
```
				{
```
```
					return _indicatortext;
```
```
				}
```
```
				set
```
```
				{
```
```
					_indicatortext = value;
```
```
				}
```
```
			}
```
```
 
```

			private static bool _flashifoff = false;

```
			public static bool FlashIfOFF
```
```
			{
```
```
				get
```
```
				{
```
```
					return _flashifoff;
```
```
				}
```
```
				set
```
```
				{
```
```
					_flashifoff = value;
```
```
				}
```
```
			}
```
```
 
```

			private static bool _flashifon = true;

```
			public static bool FlashIfON
```
```
			{
```
```
				get
```
```
				{
```
```
					return _flashifon;
```
```
				}
```
```
				set
```
```
				{
```
```
					_flashifon = value;
```
```
				}
```
```
			}
```
```
 
```

			private static bool _hideifoff = false;

```
			public static bool HideIfOFF
```
```
			{
```
```
				get
```
```
				{
```
```
					return _hideifoff;
```
```
				}
```
```
				set
```
```
				{
```
```
					_hideifoff = value;
```
```
				}
```
```
			}
```
```
 
```

			private static System.Drawing.Brush _indicatorcoloroff = System.Drawing.Brushes.LightGreen;

			public static System.Drawing.Brush IndicatorColorOFF

```
			{
```
```
				get
```
```
				{
```
```
					return _indicatorcoloroff;
```
```
				}
```
```
				set
```
```
				{
```
```
					_indicatorcoloroff = value;
```
```
				}
```
```
			}
```
```
 
```

			private static System.Drawing.Brush _indicatorcoloron = System.Drawing.Brushes.Orange;

			public static System.Drawing.Brush IndicatorColorON

```
			{
```
```
				get
```
```
				{
```
```
					return _indicatorcoloron;
```
```
				}
```
```
				set
```
```
				{
```
```
					_indicatorcoloron = value;
```
```
				}
```
```
			}
```
```
		}
```
```
	}
```
```
 
```
```
 
```
```
	public class ComboboxItem
```
```
	{
```
```
		public string Text
```
```
		{
```
```
			get; set;
```
```
		}
```
```
 
```
```
		public System.Object Value
```
```
		{
```
```
			get; set;
```
```
		}
```
```
 
```
```
		public override string ToString( )
```
```
		{
```
```
			return Text;
```
```
		}
```
```
	}
```
```
}
```
```
 
```