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requiredfieldvalidator

代码：

<!DOCTYPE html>


<html>


<body>


 


<form runat="server">


Name: <asp:TextBox id="name" runat="server" />


<br>


Age: <asp:TextBox id="age" runat="server" />


<br><br>


<asp:Button runat="server" Text="Submit" />


<br><br>


<asp:RequiredFieldValidator


ControlToValidate="name"


Text="The name field is required!"


runat="server" />


</form>


 


</body>


</html>

结果：

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