C# - Unable to set Rtf property of RichTextBox control

[cnayan]

Hi All,

I am unable to set Rtf property of a RichTextBox control. The code looks like this -

string rtfText = richTextBoxControl.Rtf;
 
int RTFLoc = rtfText.IndexOf("\\rtf");
int InsertLoc = rtfText.IndexOf('}', RTFLoc) - 1;
 
rtfText = rtfText.Insert(InsertLoc, @"{\colortbl ;\red255\green0\blue0;" + @"\red0\green255\blue0;" + @"\red0\green0\blue255;}");
richTextBoxControl.Rtf = rtfText;
 

Please assume these things -
1. I am trying to insert color table in RTF header. It doesn't exist before.
2. All search locations are not -1. They are valid locations.

The problem is that even after

richTextBoxControl.Rtf = rtfText;

the richTextBoxControl.Rtf doesn't change :(

Anybody knows this bug/feature? :)