Return Value
An System.IAsyncResult interface that represents the asynchronous operation started by calling this method.
BeginRestore method enables you to perform a restore operation without having current thread blocked. In other words, your program can continue execution while the restore operation runs in background so you do not have to wait for it.
To start the restore operation, you have to call BeginRestore method, which in turn invokes appropriate actions in another thread. Return value of this method must be assigned to an System.IAsyncResult object. After executing this method, the program flow continues.
When you are ready to finish the backup operation, call EndRestore. If at the moment you call this function the restore operation has not yet been finished, application stops and waits till the function returns.