how to close all child forms when opening other child forms in window form app in c#

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i have attached many child form to a parent form but here i want when i open a child form other opened child form should be closed in c# pls help me out with this.

Posted 10-Mar-14 21:19pm

ank170989

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Sergey Alexandrovich Kryukov 11-Mar-14 3:28am

If this is not MDI, I bet none of these forms are children to any other form. Anyway, what's the problem? Open or close whatever you want...
—SA

BillWoodruff 11-Mar-14 4:10am

Please tag your question to indicate if this is an MDI Application.

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WarLock007 · Answer 1 · 2014-03-10T21:59:00

try this it will solve your issue

C#

if (ActiveMdiChild != null)
    ActiveMdiChild.Close();

Ex:

suppose i have a MDIParent form and some child forms then on the click event of menu item the code will be as follows

C#

private void testMenuToolStripMenuItem_Click(object sender, EventArgs e)
      {
          if (ActiveMdiChild != null)
             {
               ActiveMdiChild.Close();
               ChildForm2 ch2 = new ChildForm2();
               ch2 .MdiParent = this;
               ch2 .Show();
             }

      }

and if u want to check out the name of the current Active form name before closing it then the following code will help you out :

C#

private void testMenuToolStripMenuItem_Click(object sender, EventArgs e)
       {
           if (ActiveMdiChild != null)
           {

               if (ActiveMdiChild.GetType().Name != "ChildForm2")
               {
                   ActiveMdiChild.Close();
                   ChildForm2 ch2= new ChildForm2();
                   ch2.MdiParent = this;
                   ch2.Show();
               }
               else
               {
                   MessageBox.Show("Form is already open");
               }

           }
           else
           {
               ChildForm2 ch2= new ChildForm2();
               ch2.MdiParent = this;
               ch2.Show();
           }

       }