ASP.NET AJAX UpdatePanels post less data by JSON

http://encosia.com/2007/07/11/why-aspnet-ajax-updatepanels-are-dangerous/

OLD style:

<asp:ScriptManager ID="ScriptManager1" runat="server" />

<asp:UpdatePanel runat="server" ID="up1">

<ContentTemplate>

  <asp:Label runat="server" ID="Label1" Text="Update Me!" /><br />

  <asp:Button runat="server" ID="Button1"

    Text="Postback Update" OnClick="Button1_Click" />

ContentTemplate>

asp:UpdatePanel>

protected void Button1_Click(object sender, EventArgs e)

{

 Label1.Text = DateTime.Now.ToLongDateString();

}



NEW style:

<asp:ScriptManager ID="ScriptManager1" runat="server"

 EnablePageMethods="true" />

<script language="javascript">

function UpdateTime() {

  PageMethods.GetCurrentDate(OnSucceeded, OnFailed);

}



function OnSucceeded(result, userContext, methodName) {

  $get('Label1').innerHTML = result; 

}



function OnFailed(error, userContext, methodName) {

  $get('Label1').innerHTML = "An error occured.";

}

script>

<asp:Label runat="server" ID="Label1" Text="Update Me!" /><br />

<input type="button" id="Button2" value="Web Method Update"

 onclick="UpdateTime();" />

[WebMethod]

public static string GetCurrentDate()

{

 return DateTime.Now.ToLongDateString();

}