RichtextBox 插入图片

Bitmap bmp = new Bitmap(@"D:/System/My Documents/My Pictures/Misc/4_213071.gif");
Clipboard.SetDataObject(bmp, false);

if (this.richTextBox1.CanPaste(DataFormats.GetFormat(DataFormats.Bitmap)))
  this.richTextBox1.Paste();

bmp.Dispose();