Update Program.cs (#32010)

* Update Program.cs

An error is reported when executing the migration command:
Unable to create an object of type'ApplicationDbContext'. For the different patterns supported at design time, see https://go.microsoft.com/fwlink/?linkid=851728

The entry point of dbcontext design is Program.CreateHostBuilder(), but the Program class does not have a CreateHostBuilder function.

Reference: https://docs.microsoft.com/en-us/ef/core/cli/dbcontext-creation?tabs=vs#from-application-services

* Update src/Identity/samples/IdentitySample.Mvc/Program.cs

Co-authored-by: Pranav K <[email protected]>

Author: Sc7-git

src/Identity/samples/IdentitySample.Mvc/Program.cs

@@ -7,14 +7,16 @@ public static class Program
     {
         public static void Main(string[] args)
         {
-            var host = new WebHostBuilder()
-                .UseKestrel()
-                .UseContentRoot(Directory.GetCurrentDirectory())
-                .UseIISIntegration()
-                .UseStartup<Startup>()
-                .Build();
 
+            var host = CreateHostBuilder(args).Build();
             host.Run();
         }
+
+        public static IWebHostBuilder CreateHostBuilder(string[] args) =>
+            new WebHostBuilder()
+                .UseKestrel()
+                .UseContentRoot(Directory.GetCurrentDirectory())
+                .UseIISIntegration()
+                .UseStartup<Startup>();
     }
-}
+}