[DllImport("user32.dll")]
        public static extern bool GetCaretPos(out System.Drawing.Point ppt);
        private void TextBoxParameter_Click(object sender, EventArgs e)
        {
                 // TextCursorPosition  
                System.Drawing.Point p;
                GetCaretPos(out p);

                lastCursorPosition = this.GetCharIndexFromPosition(p); 

         }

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