c# why use string.concat code example

Example 1: c# String.Concat()

string first = "hello_";
string second = "world";
/* Unite multiple strings to one new string*/

string third = String.Concat(first, second);
// string third will be now "hello_world"

Example 2: c# string concatenation

string userName = "<Type your name here>";
string dateString = DateTime.Today.ToShortDateString();

// Use the + and += operators for one-time concatenations.
string str = "Hello " + userName + ". Today is " + dateString + ".";
System.Console.WriteLine(str);

str += " How are you today?";
System.Console.WriteLine(str);