public virtual async Task <bool> Add(T entity)
 {
     try
     {
         context.Set <T>().Add(entity);
         return(await Task.FromResult(true));
     }
     catch (Exception e)
     {
         return(await Task.FromResult(false));
     }
 }
 public GenericRepository(AktifTelekomDbContext context)
 {
     this.context = context;
     this.dbSet   = context.Set <T>();
 }