private void RemoveSkill()
 {
     if (SelectedSkill != null)
     {
         UnselectedSkillList.Add(SelectedSkill);
         SelectedSkillList.Remove(SelectedSkill);
     }
 }
 private void AddSkill()
 {
     if (UnselectedSkill != null)
     {
         SelectedSkillList.Add(UnselectedSkill);
         UnselectedSkillList.Remove(UnselectedSkill);
     }
 }
 private void RemoveSkillFromPreferred()
 {
     if (SelectedSkillToRemove != null)
     {
         UnselectedSkillList.Add(SelectedSkillToRemove);
         ContractorHasSkillList.Remove(SelectedSkillToRemove);
         SelectedSkillToAdd    = null;
         SelectedSkillToRemove = null;
     }
 }
 private void AddSkillToPreferred()
 {
     if (SelectedSkillToAdd != null)
     {
         ContractorHasSkillList.Add(SelectedSkillToAdd);
         UnselectedSkillList.Remove(SelectedSkillToAdd);
         SelectedSkillToAdd    = null;
         SelectedSkillToRemove = null;
     }
 }