How to use IQueryable in WPF

Question

I am trying to create a   IQueryable in WPF
so I can filter the it with querys

i could not realy find a good explanation on how to use  IQueryable in wpf

 

this is what i tryed:
i would like to put "Namelist" in a Iqueryable and maybe filter all names that start with the letter "J" or something

 

private void IqueryableButton_Click(object sender, RoutedEventArgs e)

{

string[] names = { "jack", "eric", "micheal", "dwayne", "jade" };

List<string> NameList = new List<string>(names);

IQueryable<Products> products = NameList.

 

// i have no idea what i am suppose to do 

}