Switch between panels

Question

I have 3 panels in 1 form to go through a process to input certain data. When the next button in a panel is clicked the next panel should be displayed. Initially I have enabled the visibility of first panel and disabled the visibility of other panels.
When the next button is clicked the below code will be executed.

      panel1.Visible = false;
      panel2.Visible = true;

For the purpose of development I have put them side by side(not one upon another) and it woks perfect.
But when I put them one upon another the above code does not appear to be wok, which means when the next button is clicked it just shows a empty form.
Then I added below code too.

    panel1.SendToBack();
    panel2.BringToFront();

But it didn't work. Can someone help me with this.

Thank you.

Answer 1

This always goes wrong in the designer, the bottom panel will become the Parent of the top one. So if you hide the bottom one you can never see see the top one.

This can be worked around with View > (Other Windows) > Document Outline, drag the top panel back to the form. Still pretty painful, you typically have to edit the Location by hand and making any changes to the form in the designer later tends to slurp the panel back.

There are better ways to do this. Creating UserControls instead is highly recommended, they have their own design surface. Or use the RAD way and do this with a TabControl instead. All you have to do is hide the tabs at runtime, the subject of this Q+A.

Answer 2

You have to be careful when putting container controls like a Panel 'one upon another '.

In the designer you can do it, but only by carfully moving the panel with the keyboard. Using the mouse will always put the moved one into not upon the other one whenever its top left corner gets inside the other one.

As an alternative you can do the moving in code.

Doing it in code has the advantage of still being able to work with the lower panels and its content. Sometimes I stuff them into the tabpages of an (at runtime invisible) dummy tab and move it in or out of the pages to hide and show them..