如何让DataGridViewTextBoxColumn只能输入数字 在线等，急

Question

参考如下代码
using System.Runtime.InteropServices;[DllImport("User32.dll")]
private static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);
[DllImport("User32.dll")]
private static extern int GetWindowLong(IntPtr hWnd, int nIndex);
public const int GWL_STYLE = -16;
public const int ES_NUMBER = 0x2000;private void dataGridView1_EditingControlShowing_1(object sender, 
    DataGridViewEditingControlShowingEventArgs e)
{
    if (e.Control is DataGridViewTextBoxEditingControl)
    {
        if (((DataGridView)sender).CurrentCell.ColumnIndex == 0) // 第一列
        {
            SetWindowLong(e.Control.Handle, GWL_STYLE,
                GetWindowLong(textBox1.Handle, GWL_STYLE) | ES_NUMBER);
        }
        else
        {
            SetWindowLong(e.Control.Handle, GWL_STYLE,
                GetWindowLong(textBox1.Handle, GWL_STYLE) & ~ES_NUMBER);
        }
    }
}

Answer 1

两位小数呢？ES_NUMBER应该等于多少？