How to achieve impersonation in ASP.NET core MVC

app.Run(async (context) =>
{
    try
    {
        var user = System.Security.Principal.WindowsIdentity.GetCurrent();

        await context.Response
            .WriteAsync($"User: {"registry:HKLM\\SOFTWARE\\spg\\identity\\ASPNET_SETREG,userName"}\tPassword: {"registry:HKLM\\SOFTWARE\\spg\\identity\\ASPNET_SETREG,password"}\n");

        WindowsIdentity.RunImpersonated(user.AccessToken, () =>
        {
            var impersonatedUser = WindowsIdentity.GetCurrent();
            var message =
                $"User: {impersonatedUser.Name}\t" +
                $"State: {impersonatedUser.ImpersonationLevel}";

            var bytes = Encoding.UTF8.GetBytes(message);
            // context.Response.Body.Write(bytes, 0, bytes.Length);
        });
    }
    catch (Exception e)
    {
        await context.Response.WriteAsync(e.ToString());
    }
});