癜痫发病前预感有哪些:请问一个asp.net的问题
<html xmlns="http://www.w3.org/1999/xhtml">
<head><title></title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"/>
</head>
<body>
<form id="form1" method="post" runat="server" action="">
<table width="220" border="0" s="position: static;">
<tr >
<td colspan="3" > </td>
</tr>
<tr>
<td>用户名:</td>
<td s="width: 41px" ><asp:TextBox runat="server" ID="username" Width="86px"></asp:TextBox>
</td>
<td s="width: 51px" >
<asp:RequiredFieldValidator ID="r2" runat="server" ControlToValidate="username" ErrorMessage="请输入用户名"></asp:RequiredFieldValidator></td>
</tr>
<tr>
<td>密码:</td>
<td s="width: 41px" ><asp:TextBox TextMode="Password" runat="server" ID="password" Width="87px"></asp:TextBox></td>
<td s="width: 51px" ><asp:RequiredFieldValidator ID="r1" runat="server" ControlToValidate="password" ErrorMessage="请输入密码"></asp:RequiredFieldValidator></td>
</tr>
<tr>
<td><asp:Button runat="server" ID="b1" Text="确定" OnClick="click" /></td>
</tr>
<tr>
<td colspan="3" class="style1"> </td>
</tr>
</table>
<asp:Label ID="lb4" runat="server"></asp:Label>
</form>
</body>
</html>
click函数可以自己编写
使用<asp:RequiredFieldValidator ID="R1" runat="server" ControlToValidate="xx" ErrorMessage="xx"></asp:RequiredFieldValidator>
ControlToValidate用来表明你要控制的控件ID