Warning    76  CA2122 : Microsoft.Security : 'User.EmployeeId.get()' calls into 'PropertyValueCollection.Value.get()' which has a LinkDemand. By making this call, 'PropertyValueCollection.Value.get()' is indirectly exposed to user code. Review the following call stack that might expose a way to circumvent security protection: 
->'User.EmployeeId.get()'->'User.EmployeeId.get()' C:\ WiproDaas \ WiproDaas \ DirectoryService \ User.cs 105 DirectoryService
 public string EmployeeId
    {
        get { return this["employeeID"].Value as string; }
        set { if (!string.IsNullOrEmpty(value)) this["employeeID"].Value = value; }
    }
こんにちは、get()の近くで警告が発生しています。解決方法を教えてください。