SpinEdit限制输入的数值

private void spinEdit1_EditValueChanging(object sender, DevExpress.XtraEditors.Controls.ChangingEventArgs e)
        {
            string s = Convert.ToString(e.NewValue);
            if (s == "")
                return;
            int index = s.IndexOf('.');
            string sv = "";
            if (index == -1)
                sv = s;
            else
                sv = s.Substring(0, index);
            int v = Convert.ToInt32(sv);
            if (v < 1)
                e.Cancel = true;
        }