[c#] How to create roles in ASP.NET Core and assign them to users?

I have created an action in the Accounts controller that calls a function to create the roles and assign the Admin role to the default user. (You should probably remove the default user in production):

    private async Task CreateRolesandUsers()
    {  
        bool x = await _roleManager.RoleExistsAsync("Admin");
        if (!x)
        {
            // first we create Admin rool    
            var role = new IdentityRole();
            role.Name = "Admin";
            await _roleManager.CreateAsync(role);

            //Here we create a Admin super user who will maintain the website                   

            var user = new ApplicationUser();
            user.UserName = "default";
            user.Email = "[email protected]";

            string userPWD = "somepassword";

            IdentityResult chkUser = await _userManager.CreateAsync(user, userPWD);

            //Add default User to Role Admin    
            if (chkUser.Succeeded)
            {
                var result1 = await _userManager.AddToRoleAsync(user, "Admin");
            }
        }

        // creating Creating Manager role     
        x = await _roleManager.RoleExistsAsync("Manager");
        if (!x)
        {
            var role = new IdentityRole();
            role.Name = "Manager";
            await _roleManager.CreateAsync(role);
        }

        // creating Creating Employee role     
        x = await _roleManager.RoleExistsAsync("Employee");
        if (!x)
        {
            var role = new IdentityRole();
            role.Name = "Employee";
            await _roleManager.CreateAsync(role);
        }
  }

After you could create a controller to manage roles for the users.

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