问C#查询结果似乎已缓存-强制重新加载已修改的数据

EN

          using (nhs_patient_document_s documents = new nhs_patient_document_s(Properties.Settings.Default.DataConnectionEDM))
            {
                List<nhs_patient_document> found = documents.Select<nhs_patient_document>("nhs_patdoc_patientid", String.IsNullOrEmpty(criteria) ? String.Empty : criteria);

                output = JsonConvert.SerializeObject(found);
            }

    public List<T> Select<T>(String Field, String Value)
    {
        List<T> results = null;
        String sql = String.Empty;

        try
        {
            sql = (String.Format("select * From {0} Where {1} = '{2}'", TableName, Field, Value.Replace("'", "''")));
            results = Execute<T>(sql, CommandType.Text);
        }
        catch (System.Exception e)
        {
             throw e;
        }
        finally
        {
            sql = String.Empty;
        }

        return results;
    }

    protected List<T> Execute<T>(String CommandString, CommandType CommandType)
    {
        DataSet dataSet             = null;
        SqlConnection connection    = null;
        SqlCommand command          = null;
        SqlDataAdapter dataAdapter  = null;

        List<T> results             = null;

        try
        {
            connection          = new SqlConnection(connectionString);

            command             = new SqlCommand(CommandString, connection);
            command.CommandType = CommandType;
            command.CommandTimeout = 0;

            if (connection.State != ConnectionState.Open) connection.Open();

            dataSet     = new DataSet();
            dataAdapter = new SqlDataAdapter(command);
            dataAdapter.Fill(dataSet);

            results     = ExtractData<T>(dataSet);
        }
        catch ( System.Exception e)
        {
            throw e;
        }

        return results;

    }