private void Firm_Load(object sender, EventArgs e) { try { firmService = new FirmService(); firmService.GetAllFirm(); var firmName = txtFirmName.Text; btnFirmDelete.Enabled = false; firmId = 0; } catch (Exception ex) { MessageBox.Show(ex.Message, Comman.Product_Name, MessageBoxButtons.OK, MessageBoxIcon.Error); } finally { firmService = null; } }