c# odbcconnection not closing

Question

I've got a problem with the OdbcConnection in c#. I've written a class that wraps my connections and commands into a generic interface. The code looks basically like this (I've left out some unimportant parts)

//connection, command, _connectionType and _commandType are class members
private void getConnection(ref String commandText, out DbConnection connection, out DbCommand command, params DbParameter[] parameter)
{
    connection = Activator.CreateInstance(this._connectionType) as DbConnection;
    connection.ConnectionString = this._connectionString;
    connection.Open();
    command = Activator.CreateInstance(this._commandType) as DbCommand;
    command.Connection = connection;
    command.CommandText = commandText;
}

//Other methods use the DbCommand for SELECTS, UPDATES, etc...

private void disposeConnection()
{
    this._command.Dispose();
    this._connection.Close();
    this._connection.Dispose();

    this._command = null;
    this._connection = null;
}

I open a connection, execute my desired command and the call disposeConnection. But our Database (SAP Sybase SQL ver.11,16,17) still shows the connection in the "PREFETCH" state...

The disposeConnection is called inside a finally block after the SQL command is executed.

Why is the connection not closed correctly?

Answer 1

I've finally found the solution. I've left the DbDataReader open. I had to wrap all the DbDataReaders inside a using block. Now my connections are closed when I call _connection.close().

So it doesn't matter if the connection is in the closed state, if any other object is acessing the database, the connection is not realy closed.