Strings

// Use string interpolation to concatenate strings.

string str = $"Hello {userName}. Today is {date}."; 

String.Concat \ String.Join

string[] words = { "The", "quick", "brown", "fox", "jumps", "over", "the", "lazy", "dog." };

var unreadablePhrase = string.Concat(words);

System.Console.WriteLine(unreadablePhrase);

var readablePhrase = string.Join(" ", words);

System.Console.WriteLine(readablePhrase);

// For user input and strings that will be displayed to the end user,

// use the StringComparison parameter on methods that have it to specify how to match strings.

bool ignoreCaseSearchResult = factMessage.StartsWith("extension", System.StringComparison.CurrentCultureIgnoreCase);