String Interpolation
Another option of string concatenation, is string interpolation, which substitutes values of variables into placeholders in a string. Note that you do not have to worry about spaces, like with concatenation :
Example
string firstName = "John";
string lastName = "Doe";
string name = $"My full name is: {firstName} {lastName}";
Console.WriteLine(name);
Also note that you have to use the dollar sign ($) when using the string interpolation method.
String interpolation was introduced in C# version 6.