How to ignore case when comparing string?

Question

I am using linq to search through a list (user enters query in a textbox).

I want this to be case-insensitive and tried to use IgnoreCase, but I have no idea where to put it.... I know I could use upper or lower, but I would like to hear if anybody has any alternative methods? What would be considered best practise? Regex did not seem to work either?

        string searchQuery = tbSearchQuery.Text;
        var something= from x in y 
                       where x.Subject.Contains(searchQuery)
                       select x;

Answer 1

Since nobody else has put it up yet, I'd propose using the static String.Equals so you don't have to worry about null and get back only the information you want.

String.Compare also works but you're not trying to sort the strings (the reason for the integer return value), just determine whether they are value-equal under case-insensitive comparison.

var something = from x in y 
                where string.Equals(x.Subject, searchQuery, StringComparison.CurrentCultureIgnoreCase)
                select x;

Answer 2

string searchQuery = tbSearchQuery.Text; 
var something= from x in y  
               where x.Subject.IndexOf(searchQuery, StringComparison.OrdinalIgnoreCase) >= 0
               select x;