Read a RTF File and Remove the dynamic text

My RTF File contains a text in the beginning like below:

{\rtf1\ansi\ansicpg1252\deff0\deflang1033{\fonttbl{\f0\fnil\fcharset0 Trebuchet MS;}{\f1\fswiss\fprq2\fcharset0 Verdana;}{\f2\fnil\fcharset0 Tahoma;}{\f3\fnil\fcharset0 Arial;}{\f4\froman\f开发者_JAVA百科prq2\fcharset0 Times New Roman;}}

How can i Read the RTF File and replace with anything i wish?

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If you want to generate the RTF Header yourself you should take a look at the RTF Spec. Otherwise you might be able to simply use the RichTextBox-Control, set the font-style/color etc. and get the header from the RTFText-Property.