This snippet provides different ways to compare case insensitive strings. If you want to do a culture specific comparision, you can use the current culture instead of invariant culture.
Equal method returns boolean
Compare method returns int. 0 if equal
string str = "Test";
string str1 = "test";
//approach 1 - based on value
string.Equals( str, str1, StringComparison.InvariantCultureIgnoreCase );
//approach 2 - based on value
str.Equals( str1, StringComparison.InvariantCultureIgnoreCase );
//approach 3 - based of weights
string.Compare( str, str1, true );
//approach 4 - based on weights
string.Compare( str, str1, StringComparison.InvariantCultureIgnoreCase );
//approach 5 - based on weights
str.CompareTo( str1 ); //returns 1 -> left side has more weight than the right side
str1.CompareTo( str ); // returns -1 -> left side has less weight than left side
str1.CompareTo( str1 ); //returns 0 -> both are equal
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