Case insensitive String.Contains for C#
So, you want to use the String.contains method but you want it to be case insensitive. You can use the following test instead: string s = "MYSTRING"; if( s.IndexOf("string", 0, StringComparison.CurrentCultureIgnoreCase) != -1 ) { // String contains "string" } else { // String does not contain "string" } We use "-1" because "0" can be an index