C#如何判断当前用户是否输入某个域

代码如下：
WindowsIdentity currentIdentity = WindowsIdentity.GetCurrent();
WindowsPrincipal currentPrincipal = new WindowsPrincipal(currentIdentity);
if (currentPrincipal.IsInRole(@”HZ\Domain Users”))
{
this.button1.Text = “YEAH!”;
}