How to use ASP.NET validation controls in generic handlers (.ashx)

To be able to do something like this:

HTML

<pre lang="xml"><form id="form1" runat="server">
<input type="text" id="Name1" />
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="RequiredFieldValidator"></asp:RequiredFieldValidator>
<asp:CustomValidator ID="CustomValidator1" runat="server" ClientValidationFunction="validateName1" ControlToValidate="Name1" OnServerValidate="Name1_ServerValidate">*</asp:CustomValidator>
<br />
<input type="file" multiple="multiple" style="width: 195px;" />
<br />
<input type="button" id="btnSendEmail" value="Send" />
</form></pre>


JavaScript
<pre lang="php">$.ajax({
url: "TestAjaxHandler.ashx",
type: "POST",
...
})</pre>

ASHX
<pre lang="cs">public class TestAjaxHandler : IHttpHandler {

public void ProcessRequest (HttpContext context) {

}

protected void Name1_ServerValidate(object source, ServerValidateEventArgs args {
// Here goes validation logic
}

public bool IsReusable {
get {
return false;
}
}

}</pre>