Call server side method from client side using script manager

Hello friends.

I am going to share with you a concept to call server side method from client side using script manager.

Step 1 : Put ScriptManager on .ASPX page.

Step 2 : Set EnablePageMethods="True" in ScriptManager.

Step 3 : Create one static method in server side that return some value.

Step 4 : Set WebMethod attribute to above the method.

Step 5 : Create one javascript  function and call server side method using PageMethods object and set callback method as argument.

Step 6 : Create callback method where you will be able to retrieve return parameter from server side method.

See following example code

ScriptManager on the page.

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

My server side static method

[System.Web.Services.WebMethod]
public static int Sum(int value1, int value2)
{
        return value1 + value2;
}

My javascript function to call server side method and retrieve result from server side

<script language="javascript" type="text/javascript">
        pageMethodConcept={
            callServerSideMethod:function(){
                PageMethods.Sum(3,4,pageMethodConcept.callback);

                // I am passing 3 and 4 to get sum and set callback method
            },
            callback:function(result){
                alert(result);
            }
        }
        window.onload=pageMethodConcept.callServerSideMethod;
</script>

Happy ending. :)