Mvc Runtime error - The Role Manager feature has not been enabled

Question

I am trying to implement basic role management manually. When a user logs in if they are admin or not they are added to a role

I am getting this error:Except

Answer 1

I tried this in MVC 5 and it worked:

  <system.web>
    <authentication mode="None" />
    <compilation debug="true" targetFramework="4.5" />
    <httpRuntime targetFramework="4.5" />
    <roleManager enabled="true" />
  </system.web>

After adding the "roleManager" line shown above to the web.config, I could add a new role and add a user to the role without any exception:

   if (!Roles.RoleExists(_role))
      Roles.CreateRole(_role);

   if (!Roles.IsUserInRole(_username, _role))
      Roles.AddUserToRole(_username, _role);

Answer 2

With your DefaultRoleProvider try this

   <roleManager defaultProvider="DefaultRoleProvider" enabled ="true">

Answer 3

By default the role manger is disabled, so you have to enable it explicitly:

<roleManager enabled="true" defaultProvider="DefaultRoleProvider">