Cannot convert from 'method group'

Question

I have a little confusing about this error.

  

I am new in c#.

 

Kindly guide me ho to solve

 

Cannot convert from 'method group' to 'System.Action<object>

 

private void DeleteStudent(ObservableCollection<User> StudentCollection, User Instance)

{

StudentCollection.Remove(StudentCollection.SingleOrDefault(i => i.UserId == Instance.UserId));

}

 

how to pass the parameter to solve this error