void changeOperatorColor() { Analyser analyser = new Analyser(); string[] lines = textUrdu.Text.Split('\n'); foreach (var line in lines) { string[] words = analyser.analyse(line).Split(); foreach (var word in words) { if (Operators.find(word.Trim()) != "null") { if (textUrdu.Text.Contains(word)) { textUrdu.Select(textUrdu.Text.IndexOf(word), (word.Length)); textUrdu.SelectionColor = Color.Red; textUrdu.DeselectAll(); } } else if (KeyWords.find(word.Trim()) == "null") { textUrdu.Select(textUrdu.Text.IndexOf(word), (word.Length)); textUrdu.SelectionColor = Color.Black; textUrdu.DeselectAll(); } } } }