How to Get Relative URL From Absolute UrL in Progammaticaly

Question

foreach (SPListItem item in itemCollections)
{
string Url = item["URL"].ToString();
string[] url=Url.Split(',');
var listUrl = url[0];  //got Absolute URL Here


 var List = web.GetList(relativeUrl);
}


Absolute URl:- http://pc6/Surveys/Lists/Surveylist