normal user with administrator privileges checker by c#

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C#

dear all

i am using this code to let the application know if the user logged is as administrator or normal user

WindowsIdentity windowsIdentity = WindowsIdentity.GetCurrent();
           //To show user name use
           //windowsIdentity.Name.ToString()

           WindowsPrincipal windowsPrincipal = new WindowsPrincipal(windowsIdentity);
           //To check if user is administrator use IsInRole method
           //    MessageBox.Show("Is Adminisitrator = " + windowsPrincipal.IsInRole(WindowsBuiltInRole.Administrator));

           if (windowsPrincipal.IsInRole(WindowsBuiltInRole.Administrator) == true)
           {
               admini = "1";//admisnistrator
           }
           else
           {
               admini = "2";//non-admisnistrator
           }

it is working well but the problem is when a normal user has the privileges of administrator

this code detects that he is not administrator while he has the privileges to work as admin.


i want the normal user that has the privileges to work as admin to use my application correctly but i can not

any idea