public async Task UpdateItem(RssItem NewItem)
{
if (NewItem == null)
{
throw new ArgumentNullException("NewItem");
}
RssItem item = await rSSContext.Items.FindAsync(NewItem.Id);
if (item == null)
{
throw new Exception("The RSSItem does not exist.");
}
rSSContext.Update(NewItem);
await rSSContext.SaveChangesAsync();
}
