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How do I send a EM_XXXX message to a textbox to get some value such as line index in C#

Platform: WinForms| Category: TextBox

There is a protected SendMessage call you can use for this purpose, so you have to derive from TextBox.

	public MyTextBox : TextBox 
		private const int EM_XXXX = 0x1234;
		public int LineIndex 
            				return base.SendMessage(EM_XXXX, 0, 0);

(from on microsoft.public.dotnet.framework.windowsforms)

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