Validation ASP.Net Tutorial

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<%@ Page Language="C#" %>
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">


    Validation Image


    
    

            id="lblFirstName"
        Text="First Name"
        AssociatedControlID="txtFirstName"
        Runat="server" />
    
            id="txtFirstName"
        Runat="server" />
            id="reqFirstName"
        ControlToValidate="txtFirstName"
        Text=""
        Runat="server" />
    
            id="btnSubmit"
        Text="Submit"
        Runat="server" />