用AjaxToolkit提交表格？

Question

Can we submit a form in ASP.NET with AjaxToolkit ?

e.g:
below in our form:

<form id="form1" runat="server">
<asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
</asp:ToolkitScriptManager>
<div id="mainDiv">
<table style="width: 40%;" cellspacing="3" cellpadding="3">
<tr>
    <td>
        <asp:RequiredFieldValidator ID="RequiredFieldValidatorUsername" runat="server" ErrorMessage="*"
            SetFocusOnError="True" Text="*" ControlToValidate="TextBoxUsername" 
            ValidationGroup="login"></asp:RequiredFieldValidator>
        <asp:TextBox ID="TextBoxUsername" runat="server"></asp:TextBox>
    </td>
    <td align="left">
        : UserName
    </td>
</tr>
<tr>
    <td>
    <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="*"
            SetFocusOnError="True" Text="*" ControlToValidate="TextBoxPass" 
            ValidationGroup="login"></asp:RequiredFieldValidator>
        <asp:TextBox ID="TextBoxPass" runat="server" TextMode="Password"></asp:TextBox>
    </td>
    <td align="left">
        : Pass
    </td>
</tr>
<tr>
    <td colspan="2">
        <asp:Button ID="ButtonSubmit" runat="server" Text="Login" 
            ValidationGroup="login"/>
    </td>
</tr>
<tr>
    <td colspan="2">
        &nbsp;
    </td>
</tr>
<tr>
    <td colspan="2">
        <asp:Label ID="LabelResult" runat="server" Text="Label"></asp:Label>
    </td>
</tr>

</table>
</div>
</form>

I wanna log-in a user with Ajax so I have to send username and pass to a Webservice and get the result and show the result in LabelResult.
Can we do it with AjaxToolkit in ASP.Net?

Answer 1

for working of AJAX script manager must appear before the form which i think not possible and also Cos Callis says very well "If you want to submit the form, that is what a post back is for"