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Sorry i forgot to mention about the namespace usage.

it is..



using System.Runtime.InteropServices;


Also you need to register RichText Box events for text changed, keyDown and keyUp....

Here is one way to find out the cursor position in Rich Textbox.



private static int EM_LINEINDEX = 0xbb;
[DllImport("user32.dll")]
extern static int SendMessage(IntPtr hwnd, int message,...