如何关闭子窗体时，另一个的形式opend

//Get all  child forms in MDI container

            Form[] ChildFormArray = this.MdiParent.MdiChildren;

 

            // Loop through all child form.

            for (int iCount = 0; iCount < ChildFormArray.Count(); iCount++)

            {

               if( MessageBox.Show("Do you want to close this form " +ChildFormArray[iCount].Text, "", MessageBoxButtons.YesNo )==DialogResult.Yes)

                {

                   //Close child form

                    ChildFormArray[iCount].Close();

                }

               

            }