如何隐藏RichTextBox的插入点“|”

  通过API  
  [DllImport("user32.dll")]  
  public   static   extern   System.Int32   CreateCaret(System.IntPtr   hwnd,   System.IntPtr   hbm,System.Int32   cx,   System.Int32   cy);   
      
  [DllImport("user32.dll")]  
  public   static   extern   System.Int32   DestoryCaret();  
   
  [DllImport("user32.dll")]  
  public   static   extern   System.Int32   SetCaretPos(System.Int32   x,   System.Int32   y);  
   
  [DllImport("user32.dll")]   
  public   static   extern   System.Int32   ShowCaret(System.IntPtr   hwnd);  
   
  [DllImport("user32.dll")]  
  public   static   extern   System.Int32   HideCaret(System.IntPtr   hwnd);