Rich Text box Problem

I have a Rich Text Box Control. In which i want that only text along with its formatting(bold, color etc) be pasted. But it should discard IF clipboard item contains Image. I tried using if(!(Clipboard.GetDataObject().GetDataPresent(DataFormats.Bitmap))) { Clipboard.GetDataObject().GetFormats(); this.Paste(); } but does not allow Image to be pasted but if data to be pasted contains Image and Text both it fails to restrict. I also tried with DataFormats.Text but then only text is pasted and formatting is lost. Can anybody help me.

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