public static void zrusitOznaceni(ToolStripTextBox hledanyText, RichTextBox rtb) { if (hledanyText.ToString() == string.Empty) { return; } int s_start = rtb.SelectionStart, startIndex = 0, index; while ((index = rtb.Text.IndexOf(hledanyText.ToString(), startIndex)) != -1) { rtb.Select(index, hledanyText.ToString().Length); rtb.SelectionColor = Color.Black; startIndex = index + hledanyText.ToString().Length; } rtb.SelectionStart = s_start; rtb.SelectionLength = 0; }