string connectionString = Properties.Settings.Default.dataConnectionString;
                int i = 0;
                DateTime gendate;
                OleDbConnection conn = new OleDbConnection(connectionString);
                if (chooselistbox.Items.Count == 0)
                {
                    throw new Exception("没有数据存储");
                }
                conn.Open();
                while (i < chooselistbox.Items.Count)
                {
                    string sql = "insert into tData(fCode,fGenDate) values(?,?) ";
                    d.TryGetValue(chooselistbox.Items[i].ToString(), out gendate);
                    OleDbCommand cmd = new OleDbCommand(sql, conn);
                    cmd.Parameters.Add("?", OleDbType.VarChar, 50).Value = chooselistbox.Items[i];
                    cmd.Parameters.Add("?", OleDbType.Date).Value = gendate;
                    cmd.ExecuteNonQuery();
                    i++;
                }
                conn.Close();