C#

<br />
class Child : Form {<br />
<br />
  static Child instance=null;<br />
<br />
  static Child getInstance() {<br />
     if (instance==null) instance=new Child();<br />
     return instance;<br />
  }<br />
 ...the rest of the child class...<br />
}<br />
<br />
private void mnuitmCreateChild_Click(object sender, System.EventArgs e)<br />
{<br />
Child frmChild= Child.getInstance(); // get the Child form<br />
frmChild.MdiParent=this; // make the MDI form as the parnet for the created child form<br />
frmChild.Show(); // show the child form<br />
}<br />

// Search for the Attendance List form among the open child
// forms, and if found, activate it, restoring it if necessary
foreach(Form form in MdiChildren)
{
    if(form is AttendanceForm)
    {
        if(form.WindowState == FormWindowState.Minimized)
            form.WindowState = FormWindowState.Normal;
        form.Activate();
        return;
    }
}

// Form not open, create a new one
AttendanceForm af = new AttendanceForm();
af.MdiParent = this;
af.Visible = true;

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odbCommand.CommandType = CommandType.StoredProcedure ;
odbCommand.CommandText = "exec procs_BestMark ?, ?";

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foreach(object itemChecked in checkedListBox1.CheckedItems)

((CheckedListBox)itemChecked ).ValueMember 

SqlParameter param=new SqlParameter("@foo", myFooValue);

cmd.Parameters.Add(param);