MDIChild form open only

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I have created application that have MDIParent form and other no of forms.
Mdiparent allowing to open multiple forms. That should not be allowed so should do.
I have sample code for form below.

C#

private void employeeEntryToolStripMenuItem_Click(object sender, EventArgs e)
       {
           frmEmployeeEntry EmpEntry = new frmEmployeeEntry();
           EmpEntry.MdiParent = this;
           EmpEntry.Show();
       }

What's wrong in it.
Suggest right code pls.
Thanks in advamce.

Posted 5-Sep-12 19:41pm

SamWakchaure

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Comments

Sergey Alexandrovich Kryukov 6-Sep-12 1:56am

Why using MDI if you don't want to allow multiple children? Why using MDI at all? Who needs it, ever?
And what is the problem with your code? Is "this" a MDI container?
--SA

SamWakchaure 6-Sep-12 2:05am

its MDI Parent form.

2 solutions

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Gautam Raithatha · Answer 1 · 2012-09-05T20:01:00

Solution 1

hi...

before opening a child form, u should check whether any mdichildren forms are open, and if yes, close them, like below:

C#

foreach(Form frmChild in this.MdiChildren)
{
frmChild.Close();
}

After this, u can open new form.

Posted 5-Sep-12 20:01pm

Gautam Raithatha

Updated 5-Sep-12 20:03pm

v2

Aarti Meswania · Answer 2 · 2012-09-05T20:44:00

put new child form opening code inside this condition

C#

if (MDI.MdiChildren.Length >0)
{
 //message please close form already open
}
else
{
 //open form
}

else simple way,
use ShowDialog note: it will not allow to access MDI form till this form is closed.

C#

frmEmployeeEntry EmpEntry = new frmEmployeeEntry();
EmpEntry.ShowDialog()

Happy Coding!
:)