开始日期不能超过结束时间的check

1,winform

[csharp]
#region 日历控件

private void dteStartDate_Validating(object sender, CancelEventArgs e)
{
     if (!CheckStartDateEndDate(true))
     {
         XtraMessageBox.Show("起始日期不能大于结束日期");
         dteStartDate.Focus();
         e.Cancel = true;
     }
}

private void dteEndDate_Validating(object sender, CancelEventArgs e)
{
     if (!CheckStartDateEndDate(false))
     {
         XtraMessageBox.Show("结束日期不能小于起始日期");
         dteEndDate.Focus();
         e.Cancel = true;
     }
}

#endregion

private bool CheckStartDateEndDate(bool bLeaveFromStartDate)
{
     if (!(string.IsNullOrEmpty(dteStartDate.Text) || string.IsNullOrEmpty(dteEndDate.Text)))
     {
         if (Convert.ToDateTime(dteStartDate.Text) > Convert.ToDateTime(dteEndDate.Text))
         {
             if (bLeaveFromStartDate)
             {
                 return false;
             }
             else
             {
                 return false;
             }
         }
     }
     return true;
}

2，web

[csharp]
         if (txtStartDate.Value==null || !PageValidate.IsDateTime(txtStartDate.Value.ToString()))

strErr+="请输入正确的开始日期！\\n";

         if (txtEndDate.Value == null || !PageValidate.IsDateTime(txtEndDate.Value.ToString()))

             strErr += "请输入正确www.zzzyk.com的结束日期！\\n";

         if(Convert.ToDateTime(txtStartDate.Value.ToString()).CompareTo(Convert.ToDateTime(txtEndDate.Value.ToString()))>0)
         {
             strErr += "开始时间不能大于结束时间！\\n";
         }

     #region 日期格式判断
     /// <summary>
     /// 日期格式字符串判断
     /// </summary>
     /// <param name="str"></param>
     /// <returns></returns>
     public static bool IsDateTime(string str)
     {
         try
         {
             if (!string.IsNullOrEmpty(str))
             {
                 DateTime.Parse(str);
                 return true;
             }
             else
             {
                 return false;
             }
         }
         catch
         {
             return false;
         }
     }
     #endregion

摘自keenweiwei的专栏

补充：软件开发 , C# ,