How to get current logged in user in sharepoint object model

using (SPSite site = new SPSite(SPContext.Current.Web.Url.ToString()))
{
using (Microsoft.SharePoint.SPWeb web1 = site.OpenWeb())
{
using (Microsoft.SharePoint.SPWeb web = SPControl.GetContextWeb(Context))

{

SPUser currentuser = web.CurrentUser;

}
}
}