Getting Current webURL and Current Logged in user in sharepoint (Programatically)

Getting Current WebURL
1)In Webparts.
SPWeb web = new SPSite(SPContext.Current.Web.Url.ToString()).OpenWeb();
2)In Event receivers.(Properties)
string mysite = properties.WebUrl;
SPWeb web = new SPSite(mysite).OpenWeb();

Getting Current User
1)In webparts
string user = SPContext.Current.Web.CurrentUser.ToString();
2)In EventReceivers
string user=properties.ListItem.Web.CurrentUser.ToString();