Filteteriing by skillevel

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C#

ASP.NET

SQL

I have some data in my database like Skillname for example C#,C++ and so an, and the user can also save his skillevel that are stars that he saves from 1 star to four stars, not I am trying to, when I search for the skillname it display the Users names but I have also created a radiobuttonlist that display from 1 star to 4 stars so when the user select from the radiobuttonlist list and then select I want it to display the names that has that skill and that level.

In my search button I have like this

if (RadioDisplayLevel.SelectedIndex == 0 || RadioDisplayLevel.SelectedIndex == 1 || RadioDisplayLevel.SelectedIndex == 2 || RadioDisplayLevel.SelectedIndex == 3)
 {
      FilterStarsLevel();
 }

And my function looks like this,

private void FilterStarsLevel()
       {
         {
            using (var db = new knowitCVdbEntities())
             {
                var searchTechSkill = from p in db.EMPLOYEES
                join ets in db.EMPLOYEES_TECHNICAL_SKILLS on p.employee_id equals
                ets.employee_id join ts in db.TECHNICAL_SKILLS_VALUES on                     technical_skill_value_id equals ts.technical_skill_value_id join tsl in db.TECHNICAL_SKILL_LEVEL on ets.technical_skill_level_id equals          tsl.technical_skill_level_id where tsl.skill_level.Contains(RadioDisplayLevel.SelectedItem.Text)

                 select new Techskillsearch()
                   {
                       EmployeeId = p.employee_id,
                       Firstname = p.firstname,
                       LastName = p.lastname,
                       TechnicalSkillValueId = ts.technical_skill_value_id,
                       SkillName = ts.skill_name,
                       SkillNameOther = ets.skill_name_other,
                       SkillType = ts.skill_type,
                       TechnicalSkillLevelId = tsl.technical_skill_level_id,
                       SkillLevel = tsl.skill_level
                   };

                       foreach (var vEmp in searchTechSkill)
                       {
                           if (vEmp != null)
                           {
                               if (
                                   !_searchEmpList.Contains(vEmp.Firstname + " " + vEmp.LastName + "," +
                                                            vEmp.EmployeeId))
                               {
                                   _searchEmpList.Add(vEmp.Firstname + " " + vEmp.LastName + "," + vEmp.EmployeeId.ToString());
                               }
                          }
                       }
                   }
               }
       }

But I don't get it to work because it doesn't filter as I want to.
Any Sugestions ?