1. Download and install Xamarin Studio Community.
2. Open Xamarin Studio.
3. Click File → New → Solution.

1. Click .NET → Console Project and choose C#.
2. Click Next to proceed.

1. Enter the Project Name and Browse… for a Location to Save and then click Create.

1. The newly created project will look similar to:

1. This is the code in the Text Editor:

using System;

namespace FirstCsharp
{
    public class MainClass
    {
        public static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");
            Console.ReadLine();
        }
    }
}

1. To run the code, press F5 or click the Play Button as shown below:

1. Following is the Output: