Question

I have windows form. I have put one loading image in PictureBox

When I load form then I have set

PictureBox1.Visible = false;

While i am firing click event of button I have set

PictureBox1.Visible = true;

But in that event there is some code to retrieve data from database through stored procedure.

When it will jump to code for retrieving data from stored procedure that loading image stops to load.

It should not be happened. It should show as loading. I have used .gif loading image.

How can I solve this issue ?

Answer 1

Everytime you have a long lasting call within an eventHandler you should use a BackgroundWorker! A BackgroundWorker can run code async and therefor your button_click eventHandler will end right after starting the worker.

// add a BackGroundWorker bwLoadData to your form

private void YOURBUTTON_Click(object sender, EventArgs e)
{
     PictureBox1.Visible = true;
     bwLoadData.RunWorkerAsync();
}
private void bwLoadData_DoWork(object sender, DoWorkEventArgs e)
{
     // access your db, execute storedProcedue and store result to
     e.Result = YOUR_DATASET_RECORDS_OR_ANYTHING_ELSE;
}
private void bwLoadData_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
     if (e.Result != null)
     {
          // e.g. show data on form
     } else {
          // e.g. error message
     }
}