private void mbtnAdd_Click(object sender, EventArgs e) { if (this.mtxtTestPrice.Text == "" || this.cmbTest.SelectedIndex == -1) { MessageBox.Show("Please Select Test First"); } else { var en = new TestEntity(); var repo = new TestRepo(); en.TestName = this.cmbTest.Text.Trim(); en.TestId = this.mtxtTestId.Text.Trim(); en.Price = float.Parse(this.mtxtTestPrice.Text.Trim()); en.Date = this.dtpDate.Value.Date.ToString("yyyy-MM-dd"); //en.Discount = iRnt.Parse(this.mtxtDiscount.Text.Trim()); repo.AddToCart(en); repo.RefreshCart(mgvCart); } }