<membership defaultProvider="MySQLMembership">
   <providers>
      <clear/>
      <add name="MySQLMembership" 
           connectionStringName="MySQLConStr" 
           enablePasswordRetrieval="false" 
           enablePasswordReset="true" 
           requiresQuestionAndAnswer="true" 
           applicationName="/" 
           requiresUniqueEmail="false" 

// Howto to add the sql Memberschip provider and configure a default web application
 
// Register the sql membership provider tables in sql server
// -E      Authenticate with current Windows credentials.
// -S     server
// -d    Database        
// -A    mr        -> Membership and Role manager
    C:\Windows\Microsoft.NET\Framework\v2.0.5027>aspnet_regsql.exe -E -S server-01 -d MyDatabaseCatalogName -A mr
 
// Add membership and roleprovider to Web.config and configure connectionstings:

Imports System
Imports System.Linq
Imports System.Net.Mail
Imports System.Web.Mvc
Imports System.Web.Security
Imports MvcMembership
 
 
 
<Authorize(Roles:="Administrador")> _

--خط زیر را اول تعریف متود مورد نظر قرار دهید
--با تشکر از مسعود
[PrincipalPermission(SecurityAction.Demand, Role = "SomeRole")]