As a part of registering the client side scripts on the server we generally use the below line

Page.ClientScript.RegisterClientScriptBlock(this.G etType(), "NewAsyncMethod", newFunction.ToString(), true);


where new function is

        string js = Page.ClientScript.GetCallbackEventReference(this, "arg", "OnServerCallComplete", "ctx", "OnServerCallError", true);

        //Create a wrapper method
        StringBuilder newFunction = new StringBuilder();
        newFunction.Append("function StartAsyncCall(arg, ctx) ");
        newFunction.Append("{ ");
        newFunction.Append(js);
        newFunction.Append(" } ");
        // Now register it


Question is :-

What is ctx in GetCallbackEventReference?

There is been only limited description about it that it is just a context. But wot context is it really? WHat need does it server?

What does ctx in the above serve? why is it required.

Is it some variable that can be passed to the server for processing

?

let me know

Any luck?