private void btnThemNhaCungCap_Click(object sender, EventArgs e) { FrmNhaCungCap frmNhaCungCap = FrmNhaCungCap.Instance; frmNhaCungCap.MinimizeBox = false; frmNhaCungCap.FormClosed += FrmNhaCungCap_FormClosed; ((FrmMain)this.ParentForm).TopMost = false; frmNhaCungCap.ShowDialog(); }
private void FrmNhaCungCap_FormClosed(object sender, FormClosedEventArgs e) { _Instance = null; }