Return JSON data (object) from WebMethod (PageMethod) in ASP.Net using C# and VB.Net

Here Mudassar Ahmed Khan has explained with an example, how to return JSON data (object) from WebMethod (PageMethod) in ASP.Net using C# and VB.Net. In this example, the JSON data (object) will be populated from database and it will be returned by the WebMethod (PageMethod) to jQuery AJAX function.