**Concatenation** is the process of appending one string to the end of another. In C#, any two strings can be concatenated using the `+` operator. 

# Code

The code snippet below illustrates the process of concatenating two strings in C#:

class HelloWorld
{
    static void Main()
    {
      string FirstString = "Hello";
      string SecondString = "World";

      string ConcatenatedString = FirstString + SecondString;
      
      System.Console.WriteLine(ConcatenatedString);
    }
}

How to concatenate two strings in C#

Concatenation in C# involves appending one string to another using the + operator.