public bool SqlBulkCopyData(DataTable dt)
        {
            bool flag = true;
            if (dt != null && dt.Rows.Count > 0)
            {
                string connectionString = @"server=.\sql2012;database=Test;uid=sa;pwd=abc";
                using (SqlConnection connection = new SqlConnection(connectionString))
                {
                    connection.Open();
                    SqlTransaction sqlbulkTransaction = connection.BeginTransaction();
                    //請在插入資料的同時檢查約束，如果發生錯誤呼叫sqlbulkTransaction事務
                    SqlBulkCopy copy = new SqlBulkCopy(connection, SqlBulkCopyOptions.CheckConstraints, sqlbulkTransaction);
                    copy.DestinationTableName = "TestDemo";
                    foreach (DataColumn dc in dt.Columns)
                        copy.ColumnMappings.Add(dc.ColumnName, dc.ColumnName);
                    try
                    {
                        copy.WriteToServer(dt);
                        sqlbulkTransaction.Commit();
                    }
                    catch (Exception ex)
                    {
                        flag = false;
                        sqlbulkTransaction.Rollback();
                    }
                    finally
                    {
                        copy.Close();
                        connection.Close();
                    }
                }
            }
            return flag;
        }