بدست اوردن فضای خالی درایو

کد بدست اوردن فضای خالی یک درایو در سی شارپ:

[CSHARP]using System.Management;[/CSHARP]

[CSHARP]public double GetHDDFreeSpace(string drive)
{
//check to see if the user provided a drive letter
//if not default it to "C"
if (drive == "" || drive == null)
{
drive = "C";
}
//create our ManagementObject, passing it the drive letter to the
//DevideID using WQL
ManagementObject disk = new ManagementObject("Win32_LogicalDisk.DeviceID="" + drive + ":"");
//bind our management object
disk.Get();
//return the free space amount
return Convert.ToDouble(disk["FreeSpace"]);
}[/CSHARP]