Programmatically Delete Site Collection

Title: Programmatically Delete Site Collection
Code:

void DeleteSiteCollection(string requestUrl, string siteUrl)
        {
            SPSite site = new SPSite(requestUrl);
            SPWeb web = null;
            try
            {
                SPWebApplication webapp = site.WebApplication;
                web = site.OpenWeb();
                SPSiteCollection spSites = webapp.Sites;
                webapp.Sites.Delete(siteUrl);
            }
            finally
            {

            }
        }