asp.net客户端或服务端验证方式

客户端验证方式：

protected void Page_Load(object sender, EventArgs e)
{

if (!IsPostBack)
{
this.Button1.Attributes.Add("onclick", "return checkSame()");//为Button1添加onclick()事件 ,Button为服务器控件
}

}

<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>

服务端验证方式：using 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('用户名不能为空！');</script>"); }
Regex reg = new Regex(@"[a-z0-9_/u4e00-/u9fa5]{3,20}");
if (!reg.IsMatch(username))
{
Label2.Visible = true;
Label2.Text = "<font color=red>用户名不可用</font>";
return;
}

}