Error while disposing transaction object. - InvalidOperationExcept

[faktujaa]

Hi,
I receive the above error in my code when in debug mode but im not using
serviced components instead im making use of sql server transaction. In
short, I have defined a transaction class that is derived from connection
class. In the constructor, i open a connection if one not already present and
then start the transaction by using BeginTransaction method of connection
object. In the destructor, i have called the Dispose method that looks like:
if(mITransaction != null)
{
mITransaction.Dispose();
mITransaction = null;
}

if(mIConnection != null)
{
mIConnection.Dispose();
mIConnection = null;
}

GC.SuppressFinalize(this);
Constructor code is like:
if(objSession.mIConnection == null && objSession.mITransaction == null)
{
mIConnection = this.GetConnection();
mITransaction = mIConnection.BeginTransaction();

objSession.meDatabase = this.DatabaseType;
objSession.mIConnection = mIConnection;
objSession.mITransaction = mITransaction;
}
else
{
mIConnection = null;
mITransaction = null;
}
Session object is a custom object that stores the session information.
Now this class is instantiated in each method. At the end, CommitTransaction
method is called and in the Catch, RollbackTransaction method is called.
In debug mode i get the error in the dispose method at line mITransaction =
null; of InvalidOperationException in mscorlib.dll and Additional Info as
Handle is not initialized.
If i break and debug, it flows thru properly but always have to hit the
continue button to run the application in debug mode. Any help is highly
appreciated.
Thanks in advance.