WMI System.Management.ObjectQuery valid strings and error "User credentials cannot be used for...

[ak268]

Im new to WMI and was wondering if anybody knows if there is a reference detailing the valid query strings that can be passed in to ObjectQuery().

I am trying to get the free disk space on a remote PC. I have tried using the string

select Size from Win32_LogicalDisk where DriveType=3

but get an error "User credentials cannot be used for local connections"

This is my code:

//Connection credentials to the remote computer - not needed if the logged in account has access
ConnectionOptions oConn = new ConnectionOptions();
oConn.Username = "Administrator";
oConn.Password = "pass";

System.Management.ManagementScope oMs = new System.Management.ManagementScope("\\\\192.168.0.106", oConn);

//get Fixed disk stats
System.Management.ObjectQuery oQuery = new System.Management.ObjectQuery("select Size from Win32_LogicalDisk where DriveType=3");

//Execute the query
ManagementObjectSearcher oSearcher = new ManagementObjectSearcher(oMs, oQuery);

//Get the results
ManagementObjectCollection oReturnCollection = oSearcher.Get();

I thought that perhpas the string i am passing in to ObjectQuery is incorrect.

Any ideas?
Thanks in advance.
ak268

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