BOOST Threads memory leak with ADO .NET called indirectly

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C++

C++/CLI

.NET

ADO

I believe the problem below is related to BOOST threads versus .NET threads even though I was able to isolate the leak to a single line. When I run the same code with .NET threads using ADO .NET directly, my memory usage is about 45 MB versus > 1 GB before.

I have a block on code that uses 25 MB of memory when run single-threaded. When I have it run with 16 threads, the memory usage grows to 200MB in 5 minutes and to above 1GB eventually.

I've narrowed down the leak to ADO . NET code that executes an insert query given two inputs Query_Text and Connection_String are char * const. The function is inside dll and is called by a C++ dll without CLR, so that I do not need to use .NET threads (which is incompatible with other code).

System::Data::OleDb::OleDbConnection ^db_Conn;
try {
    db_Conn=gcnew System::Data::OleDb::OleDbConnection(gcnew System::String(Connection_String));
        System::Data::OleDb::OleDbCommand ^db_Command=gcnew
    System::Data::OleDb::OleDbCommand(gcnew System::String(Query_Text), db_Conn);
        db_Conn->Open();
        db_Command->ExecuteNonQuery();
        db_Conn->Close();
}
catch(System::Data::OleDb::OleDbException ^mySqlEx) {
    if (db_Conn)
        db_Conn->Close();
}

Can you tell me what I am doing wrong? This is the worst memory leak I have ever had. Do I need to call gc.collect() after every 100 calls or something?