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

In order to upgrade/migrate 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 Upgrade 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 project Use 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(); }) Change AddMvc method has been replaced by AddControllers in Startup.cs of each projects.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 b

Disable button after click in

To prevent double submit a form by user we need to restrict the user to click the button again. The idea is that we will use JavaScript to disable the button once user clicks first time.

Add the following lines on .aspx page

<asp:Button ID="btnProcess" runat="server" onclick="btnProcess_Click"
            Text="Process" />

Add the following line on .aspx.cs page (Page_Load).

string strProcessScript = "this.value='Processing...';this.disabled=true;";
        btnProcess.Attributes.Add("onclick", strProcessScript + ClientScript.GetPostBackEventReference(btnProcess, "").ToString());

This will disable Button, and then change the text of the button "Processing...", and then continue on with the server side event btnProcess_OnClick event handler.


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