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 private void DeleteStudent(ObservableCollection StudentCollection, User Instance) { StudentCollection.Remove(StudentCollection.SingleOrDefault(i => i.UserId == Instance.UserId)); } how to pass the parameter to solve this error

Please Try This ways private void DeleteStudent(IEnumerable StudentCollection, User Instance) { StudentCollection.Remove(StudentCollection.SingleOrDefault(i => i.UserId == Instance.UserId)); } Or private void DeleteStudent (ObservableCollection StudentCollection, User Instance) where T : User { StudentCollection.Remove(StudentCollection.SingleOrDefault(i => i.UserId == Instance.UserId)); } Better is first option so please prefer fisrt if it will work