C#

public class MainForm
{
WaitForm waitForm;

MainForm()
{
//Initializations
backgorundWorker1.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bWorkerCompletedHandler_AllReports);
}

button1_ClickEventHandler(object sender, EventArgs e)
{
  waitForm = new Waitform;
  waitform.Show();
  backgroundWorker1.DoWork += new DoWorkEventHandler(bWorkerHandler_Option1);
  backgroundWorker1.RunWorkerAsync(ReportCategory1Object);
}

void bWorkerHandler_Option1(object sender, DoWorkEventArgs e)
{
//do boring stuff with e.Argument.
Foo(e.Argument);
}

button2_ClickEventHandler(object sender, EventArgs e)
{
  waitForm = new Waitform;
  waitform.Show();
  backgroundWorker1.DoWork += new DoWorkEventHandler(bWorkerHandler_Option2);
  backgroundWorker1.RunWorkerAsync(ReportCategory2Object);
}

void bWorkerHandler_Option2(object sender, DoWorkEventArgs e)
{
//do more boring stuff with e.Argument.
Bar(e.Argument);
}

void bWorkerCompletedHandler_AllReports(object sender, RunWorkerCompletedEventArgs e)
{
  backgroundWorker1 = new BackgroundWorker(); //Shortcut to detach the DoWorkEvents. There are a lot of DoWorkEvents.
  backgorundWorker1.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bWorkerCompletedHandler_AllReports);
  waitForm.Close();
  //View report and cleanup stuff...
}

void Foo(object Something)
{
//Do Something
}

void Bar(object AnotherThing)
{
//Do Anotherthing
}
}

allasanthosh wrote:

I am getting Microsoft.jet.OLEDB not registered error

public delegate void StatusUpdateHandler(string status)

public void UpdateStartTime(string text)
 {
    if (this.InvokeRequired)
    {
      BeginInvoke(new StatusUpdateHandler(UpdateStartTime),new object[]{text} );  // this will call the UpdateStartTime method again, but second time you are routing your execution to main thread, InvokeRequired flag will be false and else part gets executed.
    }
    else
    {
      textBoxStartTime.Text = text; 
    }