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Home/ Questions/Q 1034747
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Editorial Team
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Editorial Team
Asked: May 16, 20262026-05-16T14:26:29+00:00 2026-05-16T14:26:29+00:00

The next code works perfectly (it changes the font size for -only- the selected

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The next code works perfectly (it changes the font size for -only- the selected text):

MyRichTextBox.Selection.ApplyPropertyValue(RichTextBox.FontSizeProperty, 18);

But the next code changes the font for the entire document, not only the selected text:

var SelectedFont = new FontFamily("Tahoma");
MyRichTextBox.Selection.ApplyPropertyValue(RichTextBox.FontFamilyProperty, SelectedFont);

Has anybody changed successfully only a selected text? if so… how?

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  1. Editorial Team
    Editorial Team
    2026-05-16T14:26:29+00:00Added an answer on May 16, 2026 at 2:26 pm

    The default FontFamily in Visual Studio, in my case, is also Tahoma for both a Window and a RichTextBox.

    Try switching your RichTextBox default FontFamily to Georgia, and temporarily make the font size 20 to see if the differences become visible.

    Your code worked for me as is using .NET 3.5 SP1.

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