Remove & Delete Sandbox Solution — will Deactivate and Remove the solution from the sitecollection gallery (Signature : sitecollection url(string),wspname(string))

public static bool RemoveSolution(string sitecollection, string wspname)         {             bool RemoveSuccess = false;             #region removing Solution             try             {                 SPSecurity.RunWithElevatedPrivileges(delegate()                   {                       using (SPSite site = new SPSite(sitecollection))                       {                           //Code to deactivate solution                           SPUserSolutionCollection siteSolutions = site.Solutions;                           foreach (SPUserSolution solution in siteSolutions)                           {                               if (solution.Name.Equals(wspname))                               {                                   //solution found & remove it                                   SPUserSolution solutions = site.Solutions.Cast<SPUserSolution>().                                   Where(s => s.Name == wspname).First();                                   site.Solutions.Remove(solutions);                                   break;                               }                           }                           // Code to Delete solution                           SPList solGallery = site.GetCatalog(SPListTemplateType.SolutionCatalog);                           foreach (SPListItem item in solGallery.Items)                           {                               if (item.File.Name.Equals(wspname))                               {                                   solGallery.Items.DeleteItemById(item.ID);                                   RemoveSuccess = true;                                   break;                                                                 }                           }                       }                   });             }             catch (Exception ex)             {                 RemoveSuccess = false;                // string exception = ex.Message.ToString();             }             return RemoveSuccess;             #endregion         }