I happened to read something about <a style="text-decoration:none;color:#000000" href="http://www.kettic.com/winforms_ui/csharp_guide/buttons_button_text_format.shtml" target="_top" rel="nofollow" link="external">button control text format</a>, hope the following sample snippets can offer you some reference.

<code>

this.Button1.Text = "<html>

<size=16>ButtonLabel

<br>

<b><font=Arial>Arial, Bold</b>

<br>

<i><color= Red><font=Times New Roman>Times, Italic<u>Underline</u>

<br>

<size=9>Size = 9

<br>

<color= 0, 0, 255>Sample Text";

</code>

<br/><hr align="left" width="300" />

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