private void btnRefreshLocalDB_Click(object sender, EventArgs e)
{
// Invoke LoadItemFromRemoteDB asynchronously. Pass an AsyncCallback
// delegate instance referencing the CallbackHandler method that
// will be called automatically when the asynchronous method
// completes. Pass a reference to the AsyncExampleDelegate delegate
// instance as asynchronous state; otherwise, the callback method
// has no access to the delegate instance in order to call
// EndInvoke.
AsyncLoadItemFromRemoteDB loadItemMethod = LoadItemFromRemoteDB;
IAsyncResult asyncResult = loadItemMethod.BeginInvoke(LoadItemFromRemoteDBCallback, loadItemMethod);
}
// A method to handle asynchronous completion using callbacks.
public void LoadItemFromRemoteDBCallback(IAsyncResult result)
{
// Extract the reference to the AsyncExampleDelegate instance
// from the IAsyncResult instance. This allows you to obtain the
// completion data.
AsyncLoadItemFromRemoteDB loadItemMethod = (AsyncLoadItemFromRemoteDB)result.AsyncState;
// Obtain the completion data for the asynchronous method.
DateTime completion = DateTime.MinValue;
try
{
ApplicationParameter.ItemList = loadItemMethod.EndInvoke(result);
Items = ApplicationParameter.ItemList.AsEnumerable();
CacheToLocalDB();
RefreshBindingSource();
MessageBox.Show("Local Database is updated!");
}
catch
{
// Catch and handle those exceptions you would if calling
// LoadItemFromRemoteDB directly.
}
}
