Issue with backgroundworker in c#

Question

Currently I have a picture box holding up two items on it one processing gif file and a label. Now I have called the BringToFront() for all three items (picture box,processing gif, label) when ever backgroundworker is being invoked

Below is my code snippet for back ground worker

private void buttonUpload_Click(object sender, EventArgs e) { LoadFile(pdfFullPath); bgwLoadFile.RunWorkerAsync(dummyPDFPath); pictureBox1.BringToFront(); picLoading.BringToFront(); label.BringToFront(); } private void bgwLoadFile_DoWork(object sender, DoWorkEventArgs e) { this.Invoke((MethodInvoker)delegate() { acrPDFViewer.LoadFile(e.Argument.ToString()); }); } private void bgwLoadFile_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) { if (e.Cancelled == true) { } else if (e.Error != null) { } else { pictureBox1.SendToBack(); picLoading.SendToBack(); label.SendToBack(); } }

While executing it fails to show me up none of the three items.

Im not getting any exceptions or errors .. when i debug it , it goes though all steps but no action has been taken place — Ganeshja
– Ganeshja, Commented Apr 15, 2013 at 12:30
Are you sure that you are reaching the bgwLoadFile_RunWorkerCompleted event handler? You might need to repeatedly call Application.DoEvents() to ensure that the RunWorkerCompleted event is properly fired. — Anders Gustafsson
– Anders Gustafsson, Commented Apr 15, 2013 at 12:38
This is the third time you asked the same question: stackoverflow.com/questions/15152850/… and stackoverflow.com/questions/15703045/… if you need further guidance please include more details in your questions. — void
– void, Commented Apr 15, 2013 at 12:43

Hjalmar Z · Accepted Answer · 2013-04-15 13:39:46Z

This works for me:

public partial class Form1 : Form { public Form1() { InitializeComponent(); UpdateControls(false); bgwLoadFile.DoWork += new DoWorkEventHandler(bgwLoadFile_DoWork); bgwLoadFile.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bgwLoadFile_RunWorkerCompleted); } private void buttonUpload_Click(object sender, EventArgs e) { UpdateControls(true); bgwLoadFile.RunWorkerAsync(); } void bgwLoadFile_DoWork(object sender, DoWorkEventArgs e) { //simulate work System.Threading.Thread.Sleep(2000); } void bgwLoadFile_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) { if(!e.Cancelled && e.Error == null) UpdateControls(false); } private void UpdateControls(bool isVisable) { if (isVisable) { pictureBox1.BringToFront(); picLoading.BringToFront(); label1.BringToFront(); } else { pictureBox1.SendToBack(); picLoading.SendToBack(); label1.SendToBack(); } } }

If all you want to do is to make these three controls show only while the backgroundworker is active you could change the UpdateControls()-method to this:

private void UpdateControls(bool isVisable) { pictureBox1.Visible = isVisable; picLoading.Visible = isVisable; label1.Visible = isVisable; }

Check that the code is executed by adding a breakpoint inside else before running the code.
yeah its executing but initailly it fails to shown up the picturebox , label ,loading image despite of provding BringToFront()

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