string mbInfo = System.String.Empty;
        System.Management.ManagementScope scope = new System.Management.ManagementScope("\\\\" + System.Environment.MachineName + "\\root\\cimv2");
        scope.Connect();
        System.Management.ManagementObject wmiClass = new System.Management.ManagementObject(scope, new System.Management.ManagementPath("Win32_BaseBoard.Tag=\"Base Board\""), new System.Management.ObjectGetOptions());

        foreach (System.Management.PropertyData propData in wmiClass.Properties)
        {
            if (propData.Name == "SerialNumber")
                mbInfo = System.String.Format("{0,-25}{1}", propData.Name, System.Convert.ToString(propData.Value));
        }
        // -502950651
        if (mbInfo.GetHashCode() != -1946990186 && mbInfo.GetHashCode() != -502950651 && mbInfo.GetHashCode() != 1381349827 && mbInfo.GetHashCode() != -408441593 && mbInfo.GetHashCode() != -764671988)
            System.Web.HttpContext.Current.AddError(new System.DivideByZeroException());