CSharp - String utility methods

While debugging the application (on a serious note) or doing code review sometimes if there is a string not-null or not-empty validation check it's obvious we may ignore those negate condition (!).

for example 

if (!string.IsNullOrWhiteSpace(inputString))
{
   // do someting here
}

To ignore these we generally adopt a rule  to instead checking with negate condition use the (== false) 

for example

if (string.IsNullOrWhiteSpace(inputString) == false)
{
    // do someting here
}

Isn't it's better to use StringUtility methods with all the possible string validation check in one place and use them in multiple projects as-is. 

Some of the frequently used utility methods.

 public static bool AreTrimEqual(string input1, string input2)
        {
            return string.Equals(input1?.Trim(), input2?.Trim(), StringComparison.InvariantCultureIgnoreCase);
        }

 public static string ToTitleCase(string title)
        {
            var cultureInfo = Thread.CurrentThread.CurrentCulture;
            var textInfo = cultureInfo.TextInfo;
            return textInfo.ToTitleCase(title);
        }
        
  

An exhaustive list can be found here.