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Joining with + works but gets unreadable fast. Put a $ before the quotes and you can write variables in braces.

The same line, two ways

With +

Console.WriteLine("Hi " + name + ", you are " + age);

With $

Console.WriteLine($"Hi {name}, you are {age}");

This is string interpolation. The second form reads like the sentence it produces, and it is what you will see in modern C#.

Program.cs

using System;

class Program
{
    static void Main()
    {
        string city = "Vienna";
        int visitors = 12;

        Console.WriteLine($"{visitors} people went to {city}");
    }
}

Output

12 people went to Vienna

Do not forget the $

Without it, C# prints the braces literally: {visitors} people went to {city}. If you see that, you know what is missing.

Joining with + works but gets unreadable fast. Put a $ before the quotes and you can write variables in braces.

The same line, two ways

With +

Console.WriteLine("Hi " + name + ", you are " + age);

With $

Console.WriteLine($"Hi {name}, you are {age}");

This is string interpolation. The second form reads like the sentence it produces, and it is what you will see in modern C#.

Program.cs

using System;

class Program
{
    static void Main()
    {
        string city = "Vienna";
        int visitors = 12;

        Console.WriteLine($"{visitors} people went to {city}");
    }
}

Output

12 people went to Vienna

Do not forget the $

Without it, C# prints the braces literally: {visitors} people went to {city}. If you see that, you know what is missing.

Putting values inside text

The same line, two ways

Putting values inside text

The same line, two ways