use Contains in LINQ using C#

var query6 = from n1 in names

 select n1.ToUpper() into n2

 where n1.Contains("a") // Illegal: n1 out of scope.

 select n2;

//rewrite query number 6

 var query10 = from n1 in names

 let n2 = n1.ToUpper()

 where n2.Contains("A")

 select n1;