private void BtnInventory_Click(object sender, EventArgs e)
{
if (frmInv == null || frmInv.IsDisposed)
{
frmInv = new frmInventory();
frmInv.Show();
}
}
private void BtnInventory_Click(object sender, EventArgs e)
{
frmInv = new frmInventory();
frmInv.ShowDialog();
}