public void GoToLine() { var gtlForm = new GoToLineForm(); if (gtlForm.ShowDialog() != DialogResult.OK) { return; } if (gtlForm.line.Value <= mainTextBox.Lines.Length) { mainTextBox.SelectionStart = 0; for (int i = 0; i < gtlForm.line.Value - 1; i++) { mainTextBox.SelectionStart += mainTextBox.Lines[i].Length + 2; } mainTextBox.Focus(); } else { MessageBox.Show(Messages.GotoError); } }