void ExtractUpdate()
{
BeforeArgs bArgs = new BeforeArgs();
if (BeforeExtracting != null)
BeforeExtracting(this, bArgs);
if (bArgs.Cancel)
{
// close wyUpdate
updateHelper.Cancel();
return;
}
UpdateStepOn = UpdateStepOn.ExtractingUpdate;
// extract the update
updateHelper.BeginExtraction();
}