This is an issue with the EF Core. Please update the GetAllEmployees() method in the EmployeeDataAccessLayer class by adding the following line:

return db.tblEmployee.AsNoTracking().ToList();

Dear Sir, sorry for late reply – will try on Blazor with .NET Core 3.0. and VS 19 & inform u….

Thanks for reading my blog. There is not much difference in coding when it comes to using Blazor with .NET Core 3.0. You can use the same set of code with .NET Core 3.0 and VS 19 also. Refer to (https://docs.microsoft.com/en-us/aspnet/core/blazor/get-started?view=aspnetcore-3.0) to set up the Blazor development environment with .NET core 3 and vs 19. Try to use the code explained in this article and let me know in case if you have any further issues.

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Thanks ankit.

The OnInitAsync() method will be called on page reload only. I don’t think that it is possible to refresh the drop down with only new data. if you add new records in database, it will load the whole DDL when the page is loaded.

Thanks for quick reply. I have a Product listbox with more than 50000 records.
Is it possible that ListBox refresh with only newly inserted record ?
Because when i call page. OnInitAsync() Method refreshes all data of listbox