CaseInsensitiveStringExtensions.cs

public static class CaseInsensitiveStringExtensions
{
    public static bool CaseInsensitiveContains(this string source, string toCheck)
    {
        return source.IndexOf(toCheck, StringComparison.OrdinalIgnoreCase) >= 0;
    }

    public static bool CaseInsensitiveStartsWith(this string source, string startsWith)
    {
        return source.EndsWith(startsWith, StringComparison.OrdinalIgnoreCase);
    }

    public static bool CaseInsensitiveEndsWith(this string source, string endsWith)
    {
        return source.EndsWith(endsWith, StringComparison.OrdinalIgnoreCase);
    }

    public static bool CaseInsensitiveEquals(this string source, string str)
    {
        return source.Equals(str, StringComparison.OrdinalIgnoreCase);
    }

    public static int CaseInsensitiveCompare(this string source, string str)
    {
        return string.Compare(source, str, StringComparison.OrdinalIgnoreCase);
    }
}