show wait icon on login form

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hi all
i want to show a picture box on login form as 'wait for login message' and to show WaitForloginPicturebox ,I run a new thread like below code:

C#

Thread t;
void ShowWaitImage()
{
    if (WaitForloginPicturebox .InvokeRequired)
    {
       this.WaitForloginPicturebox .Invoke(new MethodInvoker(ShowWaitImage));
    }
    else
    {
        this.pictureBox2.Visible = true;
    }
}
private void button1_Click(object sender, EventArgs e)
{
    t=new Thread(new ThreadStart(ShowWaitImage));
    t.Start();
    //...
}

but it doesn't show this.(Not Working)

Posted 7-Nov-13 2:23am

MohsenSaleh

Updated 7-Nov-13 2:27am

Pratik Bhuva

v2

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MohsenSaleh 7-Nov-13 8:46am

yes Not working
when i remove code after t.Strat() it work, but when I add code after t.Strat() not working

2 solutions

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Dave Kreskowiak · Answer 1 · 2013-11-07T03:05:00

Solution 2

It won't work because you cannot touch the UI from a background thread, or any thread other than the UI (startup) thread. Put your login code in the background thread and keep the UI stuff on the startup thread.

Posted 7-Nov-13 3:05am

Dave Kreskowiak

Arnaldo P. Castaño · Answer 2 · 2013-11-07T02:57:00

Solution 1

I believe you are invoking the same method (ShowWaitImage) recursively. You never escape from the first part of the if...else

Posted 7-Nov-13 2:57am

Arnaldo P. Castaño

Comments

MohsenSaleh 7-Nov-13 9:16am

how can escape from first part of if else?
i test it with a Boolean variable named call and change my code to :

if (WaitForloginPicturebox.InvokeRequired && call==false)
{
call = true;
this.WaitForloginPicturebox .Invoke(new MethodInvoker(ShowWaitImage));

}
else
{
this.WaitForloginPicturebox .Visible = true;

}

but don't work

Arnaldo P. Castaño 7-Nov-13 11:22am

Make sure the variable is not getting reset to false when the method is call a second time.