call content page method from .aspx page

call content page method from .aspx page

Hi,
 
I've a Master Page - Content Page scenario. I want to call server side (content page ) method using $.ajax. with normal pages I can easily call it but when I try to call content page method, instead of returning function return value, it returns parsed xhtml.
 
I use the following way to call the content page method
 
function GetBankName()
        {

            var data = { bsbNumber: $('[id$=bsbTextBox]').val() };
            data = JSON.stringify(data);



            $.ajax({
                type: "POST",
                url: "DependantDirectCredit.aspx/GetBankName",
                data: data,
                dataType: "text",
                success: function(result)
                {
                    result = result["d"];
                    $('[id$=bsbTextBox]').val(result);
                }
            });
           
        }
      












Any idea how to call a function??
 
Any help appreciated
Thanks,
Maulik