ASP.NET ºÜ²ËµÄÎÊÌâ,ÈçºÎÌø³ö IF ´úÂë¿é??

protected void btn_sea_Click(object sender, EventArgs e)
    {

        if (t_date1.Text == "" | t_date2.Text == "")
        {
            ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "s", "alert('¿ªÊ¼ÈÕÆÚ»ò½áÊøÈÕÆÚ²»ÄÜΪ¿Õ!');", true);
         
            //ÔÚÕâÀïÅжϲ»·ûºÏÌõ¼þÔòÌø³ö´úÂë,ÏÂÃæµÄ´úÂë¾Í¶¼²»Ö´ÐÐ. ²»ÖªµÀÈçºÎдѽ?

        }
     
       

        if (Convert.ToDateTime(t_date1.Text)>Convert.ToDateTime(t_date2.Text))
        {
          ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "s", "alert('¿ªÊ¼ÈÕÆÚ²»ÄÜ´óÓÚ½áÊøÈÕÆÚ!');", true);
          //ÔÚÕâÀïÅжϲ»·ûºÏÌõ¼þÔòÌø³ö´úÂë,ÏÂÃæµÄ´úÂë¾Í¶¼²»Ö´ÐÐ. ²»ÖªµÀÈçºÎдѽ?
        }

        .........................ÏÂÃ滹ÓдúÂë¿é..............................
}

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return;

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return;

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C# code

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