1. Open Visual Studio 2017.
2. Click File | New | Project  and, in the New Project template dialog box, select Visual C# in the left-hand pane and Console App (.NET Framework) in the right-hand pane:

3. In the Name: text box, type a name for your application. In this case, type HelloCSharp. Select a preferred location in the Location: drop-down list or click the Browse... button and select a location. Leave the defaults as they are:

4. Now Click OK.
5. You will be presented with a default code template for a C# console application. Let's hit F5 to give it a test run. If everything is fine, a console will pop up and close. 
6. At the end of the Main method, type the following code snippet: 

      private static string SayHello(string yourName)
      {
          return $"Hello, {yourName}";
      }

7. Now, inside your Main method, type the code that calls the previous method we just created: 

      var message = SayHello("Fiqri Ismail");
      Console.WriteLine(message);
      Console.ReadLine();

8. Now we have written our first C# code. The code of the console app should look like the following after you are done coding: 

      static void Main(string[] args)
      {
        var message = SayHello("Fiqri Ismail");
        Console.WriteLine(message);
        Console.ReadLine();
      }

      private static string SayHello(string yourName)
      {
        return $"Hello, {yourName}";
      }

9. Let's hit F5 and test the application. If everything is OK, you should see the following screen. Press Enter to exit: