[2.0] How to commit

[shakti5385]

Hi all
I make a function for execute multile query I am using transaction commit and rollback in it!
but the problem is how to commit the transaction it showing me error that use of unsigned variable transaction!

public bool ExecuteMultipleQuery(string[] queryString)
        {
            SqlConnection myConnection;
            System.Data.SqlClient.SqlTransaction transaction;
            DbCommand dbCommand;
            myConnection = OpenNewConnection();//OPEN THE CONNECTION
            dbCommand = myConnection.CreateCommand();
            try
            {
                transaction = myConnection.BeginTransaction();
                dbCommand.CommandType = CommandType.Text;
                dbCommand.Transaction = transaction;
                dbCommand.Connection = myConnection;
                foreach (string query in queryString)
                {
                    dbCommand.CommandText = query;
                    dbCommand.ExecuteNonQuery();
                }
                transaction.Rollback();
                return true;
            }
            catch (Exception ex)
            {
                transaction.Commit();//HERE GIVING ME ERROR USE OF UNSIGNED
                //VARIABLE  transaction
                return false;
            }
            finally
            {
                myConnection.Close();
                dbCommand.Dispose();
            }
        }