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Showing posts with the label Callback

Step by step migration of ASP.NET Core 2.2 to 3.1

In order to upgrade/migrate asp.net core version to 3.1 following steps to be perform.
Download and install Visual Studio 2019 version 16.4 or higher.Download and install .NET Core 3.1  https://dotnet.microsoft.com/download/dotnet-core/3.1Upgrade the projects of solution to .NET Core 3.1 , because ASP.NET Core 3.1 requires it.Update existing Nuget packages to a version compatible with ASP.NET Core 3.1 in each projectUse IHost interface from a IHostBuilder instead of building and running a IWebHost from a IWebHostBuilder in Program.cs public static IHostBuilder CreateWebHostBuilder(string[] args) => Host.CreateDefaultBuilder(args) .ConfigureWebHostDefaults(webBuilder => { webBuilder.UseKestrel() .UseSerilog() .UseStartup<Startup>(); }) Change AddMvc method has been replaced by AddControllers in Startup.cs of each projects.In Startup.cs,UseMvc method to be replaced by…

Call server side methods asynchronously without having a postback using callback in asp.net

Callback is another fabulous way to communicate with server for light weight tasks. While working in ASP.NET, sometimes we need to call server side methods asynchronously without having a postback. Sometimes it is either a full page postback or partial page postback.

To Implement callback in asp.net following interfaces to me implement in the asp.net page

ICallbackICallbackEventHandler
Let us first implement ICallbackEventHandler to call the server side method asynchronously step-by-step. The following are the definition of two methods which we need to implement. RaiseCallbackEvent method invoke through JavaScript function.


public void RaiseCallbackEvent(string eventArgument) { //populate Customer object to return Customer customer = new Customer(); customer.Name = "Muhammad Adnan"; customer.Age = 24; //javascript serialization of Customer object System.Web.Script.Serialization.JavaScriptSerializer jss; jss = new System.Web.Script.Serialization.JavaScriptSe…