C#

//Insert
WqlEventQuery q_creation = new WqlEventQuery();
q_creation.EventClassName = "__InstanceCreationEvent";
q_creation.WithinInterval = new TimeSpan(0,0,2);    //How often do you want to check it? 2Sec.
q_creation.Condition = @"TargetInstance ISA 'Win32_DiskDriveToDiskPartition'";
mwe_creation = new ManagementEventWatcher(q_creation);
mwe_creation.EventArrived += new EventArrivedEventHandler(USBEventArrived_Creation);
mwe_creation.Start(); // Start listen for events
 
internal void USBEventArrived_Creation(object sender, EventArrivedEventArgs e) 
{
 
}
 
//Remove
WqlEventQuery q_deletion = new WqlEventQuery();
q_deletion.EventClassName = "__InstanceDeletionEvent";
q_deletion.WithinInterval = new TimeSpan(0,0,2);    //How often do you want to check it? 2Sec.
q_deletion.Condition = @"TargetInstance ISA 'Win32_DiskDriveToDiskPartition'  ";
mwe_deletion = new ManagementEventWatcher(q_deletion);
mwe_deletion.EventArrived += new EventArrivedEventHandler(USBEventArrived_Deletion);
mwe_deletion.Start(); // Start listen for events
 
internal void USBEventArrived_Deletion(object sender, EventArrivedEventArgs e) 
{
 
}

public void Hashtable GetFreeDriveSpace()
{
	Hashtable drivefreespace = new Hashtable();
	// Get the management class holding Logical Drive information
	ManagementClass mcDriveClass = new ManagementClass("Win32_LogicalDisk");
	// Enumerate all logical drives available
	ManagementObjectCollection mocDrives = mcDriveClass.GetInstances();
	foreach(ManagementObject moDrive in mocDrives)
	{
		/*
		Other values of DriveType property:
		0 Unknown 
		1 No Root Directory 
		2 Removable Disk 
		3 Local Disk 
		4 Network Drive 
		5 Compact Disc 
		6 RAM Disk 
		*/
		try
		{
			//if (int.Parse(moDrive.Properties["DriveType"].Value.ToString()) == 3) //You can check the drive type here
			//{
				// sDeviceId will hold the drive name eg "C:"
				String sDeviceId = moDrive.Properties["DeviceId"].Value.ToString();
				// dSize and dFree will hold the size of the drive and free space in bytes
				double dSize = double.Parse(moDrive.Properties["Size"].Value.ToString());
				double dFree = double.Parse(moDrive.Properties["FreeSpace"].Value.ToString()); //In Byte
			//}
		}
		catch
		{
		}
	}
	mocDrives.Dispose();
	mcDriveClass.Dispose();
}

Luc Pattyn wrote:

I consider it bad practice to change the behavior of a standard Control

protected override void OnClick(EventArgs e)    <br />
{       <br />
        if(this.BeforeStateChange != null)<br />
        {<br />
            this.BeforeStateChange(this, ref cancelStateChg);<br />
        }<br />
        if(this.cancelStateChg)<br />
        {           <br />
            this.Checked = !this.Checked;<br />
        }       <br />
        base.OnClick (e);<br />
}<br />

fracalifa wrote per e-mail:

Hi Martin,
tnx, that works, but how can I prevent the statechange of the radiobutton ? Is there a cancel option which I can use for?
Tnx Frank [confused]

private bool _disable = false;
public bool Disable
{
    get
    {
        return _disable;
    }
    set
    {
        if(value!=_disable)
        {
            _disable = value;
        }
    }
}

protected override void OnClick(EventArgs e)
{
    if(!Disable)
        base.OnClick (e);
}