C#执行多条SQL语句，实现数据库事务

public static void ExecuteSqlTran(ArrayList SQLStringList)
        {
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                conn.Open();
                SqlCommand cmd = new SqlCommand();
                cmd.Connection=conn;               
                SqlTransaction tx=conn.BeginTransaction();           
                cmd.Transaction=tx;               
                try
                {          
                    for(int n=0;n<SQLStringList.Count;n++)
                    {
                        string strsql=SQLStringList[n].ToString();
                        if (strsql.Trim().Length>1)
                        {
                            cmd.CommandText=strsql;
                            cmd.ExecuteNonQuery();
                        }
                    }                                       
                    tx.Commit();                   
                }
                catch(System.Data.SqlClient.SqlException E)
                {       
                    tx.Rollback();
                    throw new Exception(E.Message);
                }
            }
        }