calling C# f. from ajax

how can I call my f in C# ex.:

public void test()

{

Label1.Text = "test";

}

from AJAX ?

I need to call that f. from dragpanelextender after dropdown event

You can either use webservice or pagemethods. Refer to this:http://miejowo.blogspot.com/2006/10/calling-web-service-with-beta.html#links