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 protected void Page_Load(object sender, EventArgs e)
    {
       
        if (!IsPostBack)
        {
            this.Button1.Attributes.Add("onclick", "return checkSame()");//ΪButton1Ìí¼Óonclick()ʼþ ,ButtonΪ·þÎñÆ÷¿Ø¼þ
        }
   }
 <script type="text/javascript">
   
   function trim(s) {
          return s.replace( /^\s*/, "" ).replace( /\s*$/, "" );
   }
      
  function checkSame(){
      var ob1=trim(document.getElementById('username').value);
      var patrn=/^[A-Za-z0-9_-]+$/;
      if(ob1.length==0) {
      alert('wrong');
      return false; }
      if (!patrn.exec(ob1)) {alert("bu pi pei"); return   false ; }
      return true;
  
     
   }
   
    </script>
·þÎñ¶ËÑéÖ¤·½Ê½£ºusing System.Text.RegularExpressions;
                    protected void Button1_Click(object sender, EventArgs e)
    {  string username=this.username.Text;
       string pass = this.password.Text;
    
      
 
       if (username.Trim().Length == 0 || username == "") { RegisterStartupScript("", "<script language=javascript>alert('Óû§Ãû²»ÄÜΪ¿Õ£¡');</script>"); }
 &n