Rich Text Box blues [unresolved]

In my application, I have a rich text box that should only contain text (in rich text format with all those tabs and styles) but not images and other things. The only way things can be 'inserted' into this box is by pasting. So here's the sub that handles this:

VB Code:

Private Sub mnuSnippetBoxPaste_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuSnippetBoxPaste.Click
  If SnippetBox.CanPaste([u]DataFormats.Rtf[/u]) Then
    SnippetBox.Paste([u]DataFormats.Rtf[/u])
  End If
End Sub

However, I get an error in both instances of DataFormats.Rtf (underlined above) that says:

Value of type 'String' cannot be converted to 'System.Windows.Forms.DataFormats.Format'.

Hope someone can tell me what I am doing wrong.

Try this:

If RichTextBox1.CanPaste(DataFormats.GetFormat(DataFormats.Rtf)) Then
RichTextBox1.Paste(DataFormats.GetFormat(DataFormats.Rtf))
End If

That works! Thank you so much :)

EDIT: Sorry about this but it still does not work. What I had done is just copied some text from the textbox itself and tested if it could paste. It did. Then I copied a bitmap and tried to paste. As expected, it did not paste it. However, when I tried to copy and paste some text from this forum (IE window), it would not paste.