null reference in my code

[maha6242]

public class MYDB : Controller
{

private string MyString;

public string MyProperty
{
get { return UserDataBaseInitalize(); }
}


public string UserDataBaseInitalize()
{
SchoolModels SH = new SchoolModels();

if (Session["IndependentSchool"] != null)
{
SH = (SchoolModels)Session["IndependentSchool"];

}
else
{
Response.Redirect("Welcome/Index");
}

return SH.SchoolDataBase;
}
}


when i call got the null reference user code

public AccountController(string db)
: this(new UserManager<ApplicationUser>(new UserStore<ApplicationUser>(new ApplicationDbContext(new MYDB().MyProperty))))
{

}

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