RadzenSecurityCode

I am not able to use RadzenSecurityCode even after specify the namespaces,

Make sure you are using latest Radzen Blazor NuGet package.

do i need to update it from NugetPackages?

You need to update only Radzen.Blazor to latest. To make sure you are using always latest version you set * similar to our demos:

Ok, Thank you, but still I am not able see the complete code for that in the website for onchange or submit method of the 4 digits password..And also i want to go to the previous box on backspace. Does these features are availbale in This component?

There is only Change event where you can perform desired action. Backspace is not supported.