Use the Rtf property of the control.
richTextBox1.Rtf = @'{\rtf1\ansi\ansicpg1252\deff0\deflang1033{\fonttbl{\f0\fswiss\fcharset0 Arial;}}\viewkind4\uc1\pard\b\i\f0\fs20 This is bold italics.\par }';
Use the Rtf property of the control.
richTextBox1.Rtf = @'{\rtf1\ansi\ansicpg1252\deff0\deflang1033{\fonttbl{\f0\fswiss\fcharset0 Arial;}}\viewkind4\uc1\pard\b\i\f0\fs20 This is bold italics.\par }';
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