Callback method to be called when the asynchronous operation is completed.
state
An object containing state information for this operation.
Return Value
An System.IAsyncResult representing the status of the asynchronous operation.
Remarks
If the FTP client is in an invalid state, for example, sending a file, the BeginDisconnect method will throw an exception. It is up to the user to call BeginAbort before calling BeginDisconnect.
The BeginDisconnect method will send the QUIT command to the FTP server and make sure that the command connection is closed.
When using a callback, the System.IAsyncResult is provided as a parameter. You should call EndDisconnect in that callback. When NOT providing a callback, you should keep the returned IAsyncResult and call EndDisconnect with it when ready to complete. In this later case, the call to EndDisconnect may block until the operation completes.
Requirements
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2