private void addToolStripMenuItem_Click(object sender, EventArgs e)
{
AddItem form6 = new AddItem();
form6.MdiParent = this;
form6.Show();
}
private void label1_Click(object sender, EventArgs e)
{
Hide();
AddItem addItem = new AddItem();
addItem.Show();
}
private void WantAddItem()
{
this.Hide();
AddItem addItem = new AddItem();
addItem.Show();
}