i'm using asp.net , and im using some Url-ReWriting technique . i need to deliver response-url accordingly to the request-url ... i got 2 ways in mind , please help me decide which is better : 1)to create ReUrl.cs file with ArrayList and store there all the response/request data , when i need to get the response-url i will do something like that .. ReUrl ru = new ReUrl(); string rUrl = ru.GetUrl(requestedUrl); Context.PathReWrite(rUrl ,false); 2) just using DataTable with 2 fields , request and response ..... and to deliver the response base on request . hope you will understand my english thanks alot