Retrieves the return value of the asynchronous operation represented by the IAsyncResult passed.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
If the asynchronous operation has not been completed, this function will block until the result is available.
In addition to the InvokeRequired property, there are four methods on a control that are thread safe: Invoke, BeginInvoke, , and CreateGraphics if the handle for the control has already been created. Calling CreateGraphics before the control's handle has been created on a background thread can cause illegal cross thread calls. For all other method calls, you should use one of the invoke methods to marshal the call to the control's thread.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2