How to get the full URL from SPListItem in SharePoint

 
1.

static string GetItemUrl(SPListItem listItem)
{
return string.Format("{0}{1}?ID={2}", listItem.Web.Site.Url, listItem.ParentList.Forms[PAGETYPE.PAGE_DISPLAYFORM].ServerRelativeUrl,listItem .ID);
}

2.

listItem.Web.Url  + the listItem.URL


3.

foreach (SPListItem listItemin list.Items)

{

XmlDocument xmlDoc = new XmlDocument();

xmlDoc.LoadXml(listItem.Xml);

XmlNamespaceManager nsm = new XmlNamespaceManager(xmlDoc.NameTable);

nsm.AddNamespace("z", "#RowsetSchema");

string fullURL = xmlDoc.SelectSingleNode("z:row", nsm).Attributes["ows_EncodedAbsUrl"].Value;

}