I need to delete a remote branch, and found this technique:

> git push origin :the_remote_branch

I tried passing it to `Network`s `Push` method in the following forms, but nothing seems to work (`options` is my login credentials):

    _repo.Network.Push(_repo.Network.Remotes["origin"], "origin/:NewBranchForDeletion", options)  
    _repo.Network.Push(_repo.Network.Remotes["origin"], ":NewBranchForDeletion", options)  
    _repo.Network.Push(_repo.Network.Remotes["origin"], ":origin/NewBranchForDeletion", options)
    _repo.Network.Push(_repo.Network.Remotes["origin"], ":refs/remotes/:origin/NewBranchForDeletion", options)
    _repo.Network.Push(_repo.Network.Remotes["origin"], ":refs/remotes/origin/NewBranchForDeletion", options)
    _repo.Network.Push(_repo.Network.Remotes["origin"], "refs/heads/:origin/NewBranchForDeletion", options)
    _repo.Network.Push(_repo.Network.Remotes["origin"], "refs/heads/:NewBranchForDeletion", options)

And a few other options.  I cannot get it to work at all, it returns errors such as (for the ":NewBranchForDeletion" method):

> Not a valid reference "NewBranchForDeletion"

### Update:

Thanks to @Rob for finding me this comment on LibGit2Sharp's repo: https://github.com/libgit2/libgit2sharp/issues/466#issuecomment-21076975

The first option fails with a `NullReferenceException` on `objectish`, and using `string.Empty` for `objectish` results in the error mentioned above.  The second option is what I am trying, except I am using the version with HTTPS validation:

    repo.Network.Push(repo.Remotes["my-remote"], objectish: null, destinationSpec: "my-branch");
    
    // Or using a refspec, like you would use with git push...
    repo.Network.Push(repo.Remotes["my-remote"], pushRefSpec: ":my-branch");