Hello every1,

Save 2 datatable in database then it saves duplicate data in C#

I am saving incoming data to a DataTable.

I would like to save this DataTable to a Database Table so I have all the data recorded.

I also do not want to have duplicate data.

        public void SaveToDBTableV2()
        {
            using (SqlConnection connection = new SqlConnection(Properties.Settings.Default.Connection))
            {
                connection.Open();
                using (SqlBulkCopy bulkCopy = new SqlBulkCopy(connection))
                {
                    bulkCopy.DestinationTableName = "dbo.EmailTest";
 
                    try
                    {
                        SqlBulkCopyColumnMapping TradeID = new SqlBulkCopyColumnMapping("TradeID", "TradeID");
                        bulkCopy.ColumnMappings.Add(TradeID);
                        SqlBulkCopyColumnMapping Price = new SqlBulkCopyColumnMapping("Price", "Price");
                        bulkCopy.ColumnMappings.Add(Price);
                        SqlBulkCopyColumnMapping Quantity = new SqlBulkCopyColumnMapping("Quantity", "Quantity");
                        bulkCopy.ColumnMappings.Add(Quantity);
                        SqlBulkCopyColumnMapping TradeTime = new SqlBulkCopyColumnMapping("TradeTime", "TradeTime");
                        bulkCopy.ColumnMappings.Add(TradeTime);
                        SqlBulkCopyColumnMapping Symbol = new SqlBulkCopyColumnMapping("Symbol", "Symbol");
                        bulkCopy.ColumnMappings.Add(Symbol);
                        SqlBulkCopyColumnMapping BuyerID = new SqlBulkCopyColumnMapping("BuyerID", "BuyerID");
                        bulkCopy.ColumnMappings.Add(BuyerID);
                        SqlBulkCopyColumnMapping SellerID = new SqlBulkCopyColumnMapping("SellerID", "SellerID");
                        bulkCopy.ColumnMappings.Add(SellerID);
                        bulkCopy.WriteToServer(DataTable, DataRowState.Added);
                    }
                    catch (Exception ex)
                    {
                    }
                }
            }
        }