private void button1_Click(object sender, EventArgs e) { if (t_Name.Text == string.Empty || t_Price.Text == string.Empty || comboBox1.SelectedItem.ToString() == string.Empty) { MessageBox.Show("Please Enter Values"); } else { ItemListService itemListService = new ItemListService(); Item item = itemListService.GetById(id); item.Id = id; item.ItemName = t_Name.Text; item.ItemPrice = Convert.ToSingle(t_Price.Text); item.ItemDescription = t_Description.Text; item.Category_Name = comboBox1.SelectedItem.ToString(); int result = itemListService.Update(item); if (result > 0) { MessageBox.Show("Item Updated."); UpdateGridView(); } else { MessageBox.Show("Error"); } } }