how to set roles in mvc

Question

i have two different tables in my application named user one and user two.i want to stop user one users to see users two index page and vice versa.how may i apply this customrole.both index pages are protected with [Authorize(roles="one/two")].

 

when debugging moves to customprovider.cs one becomes null and other found that null refrence exception i could not handle.please help me.

 

here is my customprovider.cs code

public override void AddUsersToRoles(string[] usernames, string[] roleNames)
{
throw new NotImplementedException();
}
public override string ApplicationName
{
get
{
throw new NotImplementedException();
}
set
{
throw new NotImplementedException();
}
}
public override void CreateRole(string roleName)
{
throw new NotImplementedException();
}
public override bool DeleteRole(string roleName, bool throwOnPopulatedRole)
{
throw new NotImplementedException();
}
public override string[] FindUsersInRole(string roleName, string usernameToMatch)
{
throw new NotImplementedException();
}
public override string[] GetAllRoles()
{
throw new NotImplementedException();
}
public override string[] GetRolesForUser(string username)
{
DBEntities db = new DBEntities();
string s = db.user1.Where(x => x.Email == username).FirstOrDefault().UserRole;
string s1 = db.user2.Where(x => x.Email == username).FirstOrDefault().UserRole;
if (s == null)
{
string[] res1 = { s1 };
try
{
return res1;
}
catch (Exception e)
{
e.ToString();
}
return res1;
}
else
{
string[] res1 = { s };
try
{
return res1;
}
catch (Exception e)
{
e.ToString();
}
return res1;
}
}
public override string[] GetUsersInRole(string roleName)
{
throw new NotImplementedException();
}
public override bool IsUserInRole(string username, string roleName)
{
throw new NotImplementedException();
}
public override void RemoveUsersFromRoles(string[] usernames, string[] roleNames)
{
throw new NotImplementedException();
}
public override bool RoleExists(string roleName)
{
throw new NotImplementedException();
}