Not successful to bring a active form to front or re-show a hidden form

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In my project, there are 2 forms. From the 1st (or main) form, I use the code below to show the 2nd one:

C#

formViewData frmViewData = new formViewData(iCase, m_dt[iCase], m_dt[iCase]);
frmViewData.Show();
frmViewData.BringToFront();

However, the 2nd one is still behind the 1st one. What's the proper way to solve it?
Besides I also tried another way, namely hide the 1st form by

C#

this.Hide();  // or this.Visible = false;

However, when I close the 2nd form, I could not use the code to open the 1st form.

C#

View.uxMain.Show();  // Error: An object reference is required for the non-static field, method, or properties ...

What's the proper way to solve this problem? Thanks if you can share your experience.

What I have tried:

Not successful to bring a active form to front or re-show a hidden form

Posted 24-May-17 4:46am

s yu

Updated 24-May-17 5:10am

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OriginalGriff · Answer 1 · 2017-05-24T05:09:00

Show is intended to display a new, independant form, and let the existing one continue as before - which means that when it has the user focus, it can't be "behind" the second form or the user can't see what he is doing!.

If what you are trying to do is show a form that "takes control" in the same way that a MessageBox does - effectively disabling the "parent" form until the MessageBox is closed - then that's simple:

C#

formViewData frmViewData = new formViewData(iCase, m_dt[iCase], m_dt[iCase]);
frmViewData.ShowDialog();

Processing on your main form will stop until the form is closed.
If you want to hide your main form while the other is displayed, then either:

C#

formViewData frmViewData = new formViewData(iCase, m_dt[iCase], m_dt[iCase]);
Hide();
frmViewData.ShowDialog();
Show();

Or handle the second form FormClosed event:

C#

formViewData frmViewData = new formViewData(iCase, m_dt[iCase], m_dt[iCase]);
frmViewData.FormClosed += frmViewData_FormClosed;
Hide();
frmViewData.Show();

Then in the handler:

C#

void frmViewData_FormClosed(object sender, FormClosedEventArgs e)
    {
    Show();
    }

You can do it by setting the second form to "always on top" - but that's generally more trouble than it's worth as it's system wide not application specific.