private void OnAddNewRealSkillCommand()
        {
            if (NewSkillName == null)
            {
                if (NewDefindedSkillName == null || NewDefindedSkillName == string.Empty)
                {
                    MessageBox.Show("Wybierz umiejętność!");
                    return;
                }
                var newSkill = new Skill(NewDefindedSkillName);
                BLLService.AddNewSkill(newSkill);
                ChosenSkills.Add(newSkill);
                Skills.Add(NewDefindedSkillName);
                OnPropertyChanged("Skills");
                NewDefindedSkillName = string.Empty;
            }
            else
            {

                if (!ChosenSkills.Any(x => x.SkillName.Equals(NewSkillName)))
                {
                    ChosenSkills.Add(new Skill(NewSkillName));
                }
                else
                {
                    MessageBox.Show("Podana umiejętność już została dodana!");
                }
                NewSkillName = string.Empty;
            }
        }
 public static void AddNewSkill(Skill skill)
 {
     DataAccessLayer.DALSkill.AddSkill(skill);
 }