public class CustomMembership : SimpleMembershipProvider
    {

        public override bool ValidateUser(string username, string password)
        {
            if (string.IsNullOrWhiteSpace(username) || string.IsNullOrWhiteSpace(password))
                return false;
            using (var context = new Entities()) // Entities is your Context
            {
                string encryptedPassword = Encrypt(password); // Encryt is used for comparing the entered password with the encrypted password stored in db
                var item = context.Users.Where(t => t.UserName.ToLower() == username.ToLower()
                    && t.Password == encryptedPassword
                    && t.IsActive).FirstOrDefault();
                return item != null;

            }
        }
    }

public class CustomRoleManager : SimpleRoleProvider
    {
        public override bool IsUserInRole(string username, string roleName)
        {
            using (var context = new Entities())
            {
                var result = context.UserRoles.FirstOrDefault(t => t.Role.Name == roleName
                    && t.User.UserName.ToLower() == username.ToLower()
                    && t.User.IsActive);
                return result != null;
            }
        }

        public override string[] GetAllRoles()
        {
            using (var context = new Entities())
            {
                var result = context.Roles.Select(t => t.Name).ToArray();
                return result;
            }
        }

        public override string[] GetRolesForUser(string username)
        {
            using (var context = new Entities())
            {
                var result = (from ur in context.UserRoles
                              join u in context.Users on ur.UserId equals u.Id
                              join r in context.Roles on ur.RoleId equals r.Id
                              where u.UserName.ToLower() == username.ToLower()
                              && u.IsActive
                              select r.Name).ToArray();
                return result;
            }
        }
    }

<roleManager enabled="true" defaultProvider="CustomRoleManager" cacheRolesInCookie="true">
      <providers>
        <clear />
        <add name="CustomRoleManager" type="foo.WebUI.CustomRoleManager" />
      </providers>
    </roleManager>
    <membership defaultProvider="CustomMembership" userIsOnlineTimeWindow="10">
      <providers>
        <clear />
        <add name="CustomMembership" type="foo.WebUI.CustomMembership" connectionStringName="ConnectionString" enablePasswordRetrieval="false" enablePasswordReset="false" requiresQuestionAndAnswer="false" requiresUniqueEmail="false" passwordFormat="Hashed" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10" passwordStrengthRegularExpression="" applicationName="/" />
      </providers>
    </membership>