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Load the text of your file in a RichTextBox.
Use a Find method of RichTextBox to find words.
Apply other style to the found words.

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How to find a word in a text file in c#? I need highlighted text in image h

How to find a word in a text file in c#? I need highlighted text in image ?

Load the text of your file in a RichTextBox.
Use a Find method of RichTextBox to find words.
Apply other style to the found words.

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