c# - wpf collectionviewsource filter

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I needed some advice. I have a problem with multiple searches in CollectionViewSource.

I need to know how to do this when I select multiple items from the Birthday ListBox, how to get these items into the CollectionViewSource filter.

My Code:

 private CollectionViewSource employeesCvs;
 public CollectionViewSource EmployeesCvs
 
 get return this.employeesCvs; 
 set Set<CollectionViewSource>(ref this.employeesCvs, value); 
 

 private ObservableCollection<EmployeesCollection> employees;
 private CollectionViewSource tracksCvs;
 public ObservableCollection<EmployeesCollection> Employees
 
 get return this.employees; 
 set Set<ObservableCollection<EmployeesCollection>>(ref this.employees, value); 
 


 this.EmployeesCvs.Filter += new FilterEventHandler(EmployeesCvs_Filter);

 protected void EmployeesCvs_Filter(object sender, FilterEventArgs e)
 
 EmployeesCollection vm = e.Item as EmployeesCollection;
 e.Accepted = Utils.FilterEmployees(vm, SearchText);

 
 public static bool FilterEmployees(EmployeesCollection employees, string filter)
 
 employees.LastName.ToLower().Contains(s.ToLower()) 

My idea:

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