StringBuilder problem

Hello,

Do you know how I can change font size using StringBuilder?

Code:

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StringBuilder str = new StringBuilder();
str.Append(@"&""Arial,Regular""test");

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and how can I add a text from a textBox to it? (instead of "test" in the example above)

You cannot change font size. The font size is a property of the display element. A stringBuilder only holds text, no formatting.

str.Append( textBox1.Text ); => will append the text of TextBox1 to your string.