Make the selected text bold

Hi,

Now don't get me wrong, I'm no beginner but I just have not done this for a year so I have forgot. I want to select some text and make only the selected text bold when the bold button is pressed. I tried this:

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txtComment.Seltext = txtComment.Font.Bold
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What wrong here?

Thanks

in a text box you cannot make parts of the Text bold. Use a RichtText Control instead.