C# LanguageString Interpolation

Syntax

$"content {expression} content"
$"content {expression:format} content"
$"content {expression} {{content in braces}} content}"
$"content {expression:format} {{content in braces}} content}"

Remarks

String interpolation is a shorthand for the string.Format() method that makes it easier to build strings with variable and expression values inside of them.

var name = "World";
var oldWay = string.Format("Hello, {0}!", name);  // returns "Hello, World"
var newWay = $"Hello, {name}!";                   // returns "Hello, World"