给textbox的lines赋值

            string[] lines = txtSql.Lines;
            for (int i = 0; i < lines.Length; i++)
            {
                lines[i] = comboBox1.Text + lines[i];
            }

            txtSql.Lines = lines;

 

必须这样做，如下方法行不通：

for (int i = 0; i < txtSql.Lines.Length; i++)