how 2 put 2 strings together in c# code example

Example 1: how to append something to a string in c#

string fName = "hello ";    
string lName = "world";    
string Name = string.Concat(fName, lName); 
//or
string firstName = "hello ";    
string lastName = "world";    
string name = firstName + " " + lastName;

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);