DatagridView dosent show any data when I load it to panel

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I put a Datagridview inside a UserControl. and I load this usercontol inside a panel in my mainform by pressing a button but it dosent show any data from my database
my code is for button click:

C#

foreach (Control ctrl in panelMain.Controls)
            {
                ctrl.Dispose();
            }
           
            panelMain.Controls.Add(new usercontrol());

Posted 12-Feb-11 3:08am

rad444

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OriginalGriff · Answer 1 · 2011-02-12T03:16:00

Solution 1

The code fragment you have given us may / may not display any data: it is all dependant on the usercontrol constructor you have written.

Since we can't see if you have made any database accesses in your constructor, we can't see if there is a problem.

But, at a guess, when you designed it, you probably set a datasource value in the designer? Do you do that in your constructor?

Posted 12-Feb-11 3:16am

OriginalGriff

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rad444 12-Feb-11 9:21am

I set a datasource in the designer only
what I have to do with constructor ?

OriginalGriff 12-Feb-11 9:29am

When you set it in the designer, you set it only for the instance you were testing.
When you add it to your panel, you create a new instance - it has the default values of the control.
Either
1) modify the constructor of the usercontrol to set the DataSource correctly (not recommended)
or
2) Set the DataSource when you create the instance.

It don't recommend the first option because it fixes the control to a particular form. Make it flexible, so you can re-use it.

BTW: Change it's name! "usercontrol" is not exactly descriptive of what it does! :laugh:

rad444 13-Feb-11 5:23am

Can you explain about 2nd method by an example or is there any resource I refer to ?

rad444 · Answer 2 · 2011-02-14T20:51:00

Solution 2

http://msdn.microsoft.com/en-us/library/ms233813%28v=vs.80%29.aspx#Y1482[^]

Posted 14-Feb-11 20:51pm

rad444