Find and Replace

Windows Forms User's Guide > Howto: Edit and Format Text From Code

As an alternative to specifying start position and length of a word to be selected, the TextControl.Find method can be used to locate it. In this example, the font size of the word 'Text' is changed.

textControl1.Text = "TX Text Control";
textControl1.Selection.FontSize = 400;
[Visual Basic]
TextControl1.Text = "TX Text Control"
TextControl1.Selection.FontSize = 400

It is also possible to replace a piece of text once it has been selected. Note that there is no dedicated Replace method for this purpose, you simply use the Selection.Text property instead.