OleDb DataAdapter and Reading .bin File

[mfhiltabidel]

I am a hobbyist in c++ programming, and have been fighting this issue for days. I am using an OleDb DataAdapter to fill a DataTable from an AS/400 data source. There is over 8,000 records in the Table and was playing with the idea of first loading the DataTable from a .bin or .xml file and then refreshing the rows with the DataAdapter.Fill method (only a few rows change from day to day). Unfortunately every time the DataAdapter fills the DataTable it duplicates every row it reads from the .bin file and I have not been able to successfully map it to the DataAdapter.Fill method.

void Form1::loadData()
{

	String^ myConnString = "Provider=provider;Data Source=datasource;";
	String^ myQuery = "SELECT IMINV# FROM SourceTableName WHERE IMINV# = '00' ORDER BY 1";

	OleDbDataAdapter^ myAdapter = gcnew OleDbDataAdapter(myQuery, myConnString);

	// Create DataTable and define Primary Key
	invList = gcnew DataTable("invList");
	invList->PrimaryKey = gcnew array<DataColumn^> {invList->Columns["MINV#"]};

	// Load DataTable from disk
	Form1::readSerialize();	

	DataTableMapping^ tableMapping = gcnew DataTableMapping("Table", "invList");
	tableMapping->ColumnMappings->Add("IMINV#","MINV#");

	myAdapter->TableMappings->Add(tableMapping);

	//  Have also tried MissingSchemaAction::AddWithKey
	myAdapter->FillSchema(invList, SchemaType::Mapped);
	myAdapter->Fill(invList);

	// Save DataTable to disk, normally would be done when user exits the program
	Form1::writeSerialize();
		
	// Binds DataTable to a dataGridView
	mySource = gcnew BindingSource();
	mySource->DataSource = invList;
	dataGridView1->DataSource = mySource;
	
}

And the code for the read and write, originally I just used DataTable.ReadXml, because it was easier, but after searching a few posts this was suggested.

void Form1::readSerialize()
{
	 FileStream^ fs;

          try
	  {
	      // Opens the file containing the data to deserialize.
	      fs = gcnew FileStream( "Inventory.bin",FileMode::Open, FileAccess::Read);

		try
		{
			IFormatter^ formatter = gcnew BinaryFormatter;
			// Deserialize the hashtable from the file and 
			// assign the reference to our local variable.
			invList = (DataTable^)formatter->Deserialize(fs);
		}

		catch ( SerializationException^ e ) 
		{
			MessageBox::Show(String::Format("Failed to deserialize. Reason: {0}", e->Message));
			throw;
		}

		finally
		{
			fr->Close();
		}
	  }

	  catch (FileNotFoundException^ e)
	  {
		MessageBox::Show(e->ToString());
	  }
}

void Form1::writeSerialize()
{

	FileStream^ fs = gcnew FileStream( "Inventory.bin",FileMode::OpenOrCreate );

	// Construct a BinaryFormatter and use it to serialize the data to the stream.
	IFormatter^ formatter = gcnew BinaryFormatter;

	try
	{
		formatter->Serialize( fs, invList );
	}

	catch ( SerializationException^ e ) 
	{
		MessageBox::Show(String::Format("Failed to serialize. Reason: {0}", e->Message));
		throw;
	}

	finally
	{
		fs->Close();
	}
	
}

This Select statement should only return a single column with a single row, which it does, but adds a duplicate row every time the program runs. I have tried several of my ideas, but nothing really works. Any help on my confusion would be much appreciated, thank you.