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How to add line or string in the host file and also find and delete specific string from the host file using C#?

String.Replace return new String. Try this.

private void unblockButton_Click(object sender, EventArgs e)    


    string text = File.ReadAllText(path);

    text = text.Replace(" www.google.com", string.Empty);

    File.WriteAllLines(path, new[] { text });    

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