windows form label visibility property problem

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Hi,

I am trying to create a win form.In it there is a label which by default is not visible. Based on a condition i am setting its visibility to true. But one issue is there.

If i run the program without debugging am not able to see the label.
But when i debug to the place where i change the visibility property and then hit F5 , i am able to see. Weird rt??? please help me

THis is the code

C#

if (_dtWorkitems != null && _dtWorkitems.Rows.Count > 0)
              {
                  pgBar.Minimum = 1;
                  pgBar.Maximum = _dtWorkitems.Rows.Count;
                  pgBar.Step = 1;
                  pgBar.Visible = true;
                  txtMsg.Visible = true;
              }

The condition was that if a data table is not null then i am changing the visibility. Then i am looping the datatable . At the end i am changing the property of the label & progressbar back to false. I tried commenting that and the label was shown after exiting the loop. Why

Posted 7-Apr-14 0:49am

Arjun Menon U.K

Updated 7-Apr-14 1:25am

v3

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Nagaraj Muthuchamy 7-Apr-14 6:56am

Are you setting the property in Form_Load function ?

Posting the code here can help to understand the problem better.

Arjun Menon U.K 7-Apr-14 7:01am

I am setting this property on Button click. What puzzles me is that it works for Progress bar, then y not for txtbox or label

ZurdoDev 7-Apr-14 7:23am

What is the property set to in design view and then put a breakpoint and make sure your code is actually running the part where it gets set visible.

Arjun Menon U.K 7-Apr-14 7:32am

Did you see the code i posted above. I am setting the visibility of both label & progress bar in that if statement and its working for pgbar nd not for label,provided am not debugging it :'(

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V. · Accepted Answer · 2014-04-07T01:24:00

Solution 1

try calling invalidate or update or something. that should force a redraw.
If you leave the label visible from the start. is it there then?

Posted 7-Apr-14 1:24am

V.

v2

Comments

Arjun Menon U.K 7-Apr-14 7:27am

Then y its working for progress bar?

V. 7-Apr-14 7:33am

progress bar is a different control from the rest because it needs to update itself based on values. So it has som form of an inherent redraw. I had similar problems when using label updates simultaneously with progress bar updates.
Is the solution working then, or not?

Arjun Menon U.K 7-Apr-14 7:56am

Hi , it worked when i called Update(). Thanks a lot. But my question is why it works while debugging, from what you have said it means that debugging causes the control to redraw. Correct me if i am wrong. The visible setting to false works without the update function which puzzles me more

V. 7-Apr-14 8:07am

That is a common issue. I always blame it on internal timing issues dus to optimizations for "release" compilation, but the truth is, I don't know. I just know that in some occasions there is a difference.
Glad it worked.

Arjun Menon U.K 7-Apr-14 8:11am

:) thanks buddy