Insertar imagen en richtextbox

[Trulala de cordoba]

Fijate si te sirve este ejemplo:

Código:

public void InsertImage()  {
  ...
  string lstrFile = fileDialog.FileName;
  Bitmap myBitmap = new Bitmap(lstrFile);
  // Copy the bitmap to the clipboard.

  Clipboard.SetDataObject(myBitmap);
  // Get the format for the object type.

  DataFormats.Format myFormat = DataFormats.GetFormat (DataFormats.Bitmap);
  // After verifying that the data can be pasted, paste

  if(NoteBox.CanPaste(myFormat)) {
    NoteBox.Paste(myFormat);
  }
  else {
    MessageBox.Show("The data format that you attempted site" + 
      " is not supportedby this control.");
  }
  ...
}

http://www.codeproject.com/KB/edit/csexrichtextbox.aspx