public FORM_PRODUCTS()
{
InitializeComponent();
btn_update.Enabled = false;
btn_delete.Enabled = false;
btn_print.Enabled = false;
btn_add.Enabled = true;
if (frm == null) /*بعين قيمة لل form لو قيمتة ب null وهى تكون قيمتها الحالية */ // .......[4]
{
frm = this;
}
this.dataGridView1.DataSource = prd.GET_ALL_PRODUCTS();
}
private void productManagementToolStripMenuItem_Click(object sender, EventArgs e)
{
FORM_PRODUCTS frm = new FORM_PRODUCTS();
frm.ShowDialog();
}
private static FORM_PRODUCTS frm; // ......................[1]
static void frm_formclosed(object sender, FormClosedEventArgs e) // ................[2]
{
frm = null;
}