private void buttonSave_Click(object sender, EventArgs e)
        {
            //MessageBox.Show("I am Clicked");
            TransactionClass transaction = new TransactionClass();

            transaction.TransactionType    = labelPurchase.Text.Trim();
            transaction.TransactioDate     = DateTime.Now;
            transaction.SysUser            = "******";
            transaction.GrandTotal         = decimal.Parse(labelGrandTotal.Text);
            transaction.TransactionDetails = dtTransaction;

            bool success = false;

            using (TransactionScope scope = new TransactionScope())
            {
                int  transactionID = -1;
                bool w             = transactionDAL.Insert_Transaction(transaction, out transactionID);//Error in this section

                for (int i = 0; i < dtTransaction.Rows.Count; i++)
                {
                    int ProductID = int.Parse(dtTransaction.Rows[i][0].ToString());
                    //string ProductName = dtTransaction.Rows[i][1].ToString();
                    decimal Rate     = decimal.Parse(dtTransaction.Rows[i][2].ToString());
                    decimal Quantity = decimal.Parse(dtTransaction.Rows[i][3].ToString());
                    decimal Discount = decimal.Parse(dtTransaction.Rows[i][4].ToString());
                    decimal Tax      = decimal.Parse(dtTransaction.Rows[i][5].ToString());
                    decimal Total    = decimal.Parse(dtTransaction.Rows[i][6].ToString());

                    TransactionDetails td = new TransactionDetails();
                    td.ProductID = ProductID;
                    td.Rate      = Rate;
                    td.Quantity  = Quantity;
                    td.Discount  = Discount;
                    td.Tax       = Tax;
                    td.Total     = Total;
                    bool x = invDAL.Increase_Inventory(ProductID, Quantity); //For Decreasing Product Quantity
                    bool y = transactionDAL.Insert_TransactionDetails(td);
                    success = w && x && y;                                   // DO this after solving error
                    //success = y; //Comment this after solving error
                }
                if (success == true)
                {
                    scope.Complete();
                    MessageBox.Show("Purchase Transaction Completed.");
                }
                else
                {
                    MessageBox.Show("Purchase Transaction Failed.");
                }
            }

            //MessageBox.Show("Print Me");
        }