MDI Child open and close

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I want to avoid my child form from appearing many times when a user tries to open the child form which is already open in MDIParent. the same Child Form Opens and I can see two child form are in MDI.The following code solve this problem
public partial class Home : Form
{
ShopMaster shopmaster=null;
private void shopMasterToolStripMenuItem_Click(object sender, EventArgs e)
{

if (shopmaster == null)
{
shopmaster = new ShopMaster();
shopmaster.MdiParent = this;
shopmaster.Show();
}
}
}
but if i close this child it never open again. so i just want that if child1 is open then it should not open again untill it get close. After closing it we can open it again.

Posted 22-Aug-12 21:06pm

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[no name] 23-Aug-12 4:04am

If you find answer then click on accept answer(Green button) click on the stars(1-bad ,5 best).
This will help others to find the solution

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Sourav Sarkar-SS · Accepted Answer · 2012-08-22T21:47:00

Make your variable as static

C#

public static ShopMaster shopmaster=null;

then write the code in FormClosing event of your ShopMaster

C#

private void ShopMaster_FormClosing(object sender, FormClosingEventArgs e)
      {
          string ans = (MessageBox.Show("Are you sure to Exit!", "Confirmation", MessageBoxButtons.YesNo, MessageBoxIcon.Question)).ToString();
          if (ans == "Yes")
          {
              Home.shopmaster=null;
          }
          else
          {
              e.Cancel = true;
          }

      }