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

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

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There is a protected SendMessage call you can use for this purpose, so you have to derive from TextBox. public class CustomTextBox : TextBox { private const int EM_XXXX = 0x1234; public int LineIndex { get { return base.SendMessage( EM_XXXX, 0, 0 ); …

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