C# – MultiThreading error: There is already an open DataReader associated with this Connection which must be closed first

I have a Parallel.Foreach loop

var options = new ParallelOptions();
options.MaxDegreeOfParallelism = 1;
Parallel.ForEach(urlTable.AsEnumerable(),drow =>
{
    using (var WCC = new MasterCrawlerClass())
    {
        WCC.MasterCrawlBegin(drow);
    }
 }

This loop calls the class and loops through all my DataRows, however each of those datarows either does a DataTable fill, or does an update command to a MySQL DB. The code I have for both of those is below.

private static DataTable DTTable(string mysqlQuery, string queryName)
{
    DataTable DTTableTable = new DataTable();
    try
    {
        MySqlDataAdapter DataDTTables = new MySqlDataAdapter(mysqlQuery, MySQLProcessing.MySQLStatic.Connection);
        DataTable DataDTTablesDT = new DataTable();
        DataDTTables.SelectCommand.CommandTimeout = 240000;
        DataDTTables.Fill(DataDTTablesDT);
        DTTableTable = DataDTTablesDT;

    }
    catch (Exception ex)
    {

        GenericLogging("Failed MySQLquery: " + ex.Message.ToString(), "MySQLProcessor", "DTTable", "", "MysqlError", "", queryName, mysqlQuery);

    }
    return DTTableTable;
}

private static void MySQLInsertUpdate(string MySQLCommand, string mysqlcommand_name)
{
    try
    {
        MySqlCommand MySQLCommandFunc = new MySqlCommand(MySQLCommand, MySQLProcessing.MySQLStatic.Connection);
        MySQLCommandFunc.CommandTimeout = 240000;
        MySQLCommandFunc.ExecuteNonQuery();
    }
    catch (Exception ex)
    {
        GenericLogging("Failed MySQLquery: " + ex.Message.ToString(), "MySQLProcessor", "DTTable", "", "MysqlError", "", mysqlcommand_name, MySQLCommand);
    }
}

The thing is WCC contains 10 or so voids, each of these voids accesses the MySQL functions at least once. So if locking is the answer, is it possible to create 1 locking function for all voids? If so how? If there is another way, please let me know

Thanks!

Okay as suggested i consolidated the questions

The code has now been updated to reflect locking, please see below.

static readonly object _object = new object();

public static DataTable DTTable(string mysqlQuery, string queryName)
        {
            lock (_object)
            {
                DataTable DTTableTable = new DataTable();
                try
                {
                    using (MySqlDataAdapter DataDTTables = new MySqlDataAdapter(mysqlQuery, MySQLProcessing.MySQLStatic.Connection))
                    {
                        using (DataTable DataDTTablesDT = new DataTable())
                        {
                            DataDTTables.SelectCommand.CommandTimeout = 240000;
                            DataDTTables.Fill(DataDTTablesDT);
                            DTTableTable = DataDTTablesDT;
                            DataDTTables.Dispose();
                        }
                    }

                }
                catch (Exception ex)
                {

                    GenericLogging("Failed MySQLquery: " + ex.Message.ToString(), "MySQLProcessor", "DTTable", "", "MysqlError", "", queryName, mysqlQuery);

                }
                return DTTableTable;
            }
        }

This is the only code that calls the DataReader, how can there be two open data readers if there is a lock?