How to call code behind methods / Server side script / Server side static methods / Non static Methods using java script / .Net

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Introduction

The basic idea of designing this module is to give an idea to call server side methods or sever side script using java script and Asp.Net. In this example I am calling Static methods and non static methods using two different techniques. Most of programmer are aware of these techniques, here by demonstrating it, I am trying to simplify things.

1) Using Ajax.Net Script manager to call static methods
2) Client call back to call non static methods

Using Ajax.Net Script manager to call static methods:

Important points to note down while using this technique:- .aspx page

Step 1: Make property EnablePageMethods="true" Of ScriptManger

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

Step 2: To call server side method in client side script use 'PageMethods' object which is created by Script manger implicitly.

//
//PageMethods.ServerSideStaticMethod(ServerParams,Callback Client side mehod to receive resulty


<pre>//    , Callback method to receive any error during call)

Step 3:To get the result back on client side use the following method

//JS function
//function OnSucceeded(result, userContext, methodName)

Step 4:To catch any error if happened durin processing use

//JS function
//function OnFailed(error, userContext, methodName) 

Use .cs file:-Step 5::Mark your public method in code behind with System.Web.Services.WebMethod and with static modifyier

//Code behind
//[System.Web.Services.WebMethod]
//public static String CallServerForDate()
 //{}

Using Client call back to call non static methods:

Important point to node down while using this technique:-

User .cs file:-Step 1 : First of all your page class should implement ICallbackEventhandler and its two methods GetCallbackResult() and RaiseCallbackEvent()

Step 2:Register Client side call back method signature from code behind using GetCallbackEventReference method of ClientScriptManger class

//Code behind
//Page.ClientScript.GetCallbackEventReference(this, "arg",
//     "CallbackOnSucceeded", "context", "CallbackOnFailed", true);

Step 3 : Register one more client side function which actualy call the RaisCallbackEvent mehotd in server side script , using RegisterClientScriptBlock method of ClientScriptManger class as CallServer() this method implicitly call Client side callback methods in order to make some kind of data communication with Server.

//Code behind
//String clientFunction = "function CallServer(arg, context){ "
//                       + callBack + "; }";
//       Page.ClientScript.RegisterClientScriptBlock(this.GetType(),
//                "Call To Server", clientFunction, true);

Step 4:Define server side method and call it inside RaiseCallbackEvent() method.

//Code behind
//void ICallbackEventHandler.RaiseCallbackEvent(string eventArgument)
//    {
//        returnValue = ServerSideMethod(eventArgument); 
//    }

// 

Step 5: And result will be send back by GetCallBackResult() methods from the code behind

//Code behind
//string ICallbackEventHandler.GetCallbackResult()
//    {
//        return returnValue;
//    }

// 

Step 6: Define the method signature using java script which were declared in step 2

//JS function
//function CallbackOnSucceeded(result,context){}
//function CallbackOnFailed(result,context){}

// 

Step 7: And make a call to Client side method CallServer() using java script, which were defined in step 3.

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