Disclaimer: If you are a skilled C# developer, I apologize for any mistakes I made, they we unintentional. :)

Ok, there we go. No more conferences so time to do some actual blogging.

This is part 2 of my NAV in C# series. If you have not done so, please read part 1.

In this episode we will talk about classes.

In C# a class is very powerfull. It’s a datatype that you can form yourself giving it properties and methods. And since C# is object oriented, you can inherit from classes etc.

But let’s not get into these details. The blog series is intended to explain C# from a Dynamics NAV perspective.

So how do we map a class to Dynamics NAV.

Actually you could see a table or a codeunit as a class.

A Table is a Class

Let’s start with that. Let’s have a look at the customer table in NAV. It has a bunch of fields


So how would something like that look like in C#:


Each field is a property. You can see that it is a property because it has the { get; set; } syntax

If you would like to code against it you would declare a new customer like this

Customer Cust = new Customer();

Cust.Name = “Mark Brummel”;

Cust.Address = “Somewhere”;

This would create a new instance of the class and populate the name

Number Series

But we have number series in NAV.  So let’s make that

A Codeunit as a class

Let’s make a class that can return number series.


This is a very simple class with a method that returns a number. It should be smarter but I hope it explains the idea

Return the number in the customer

So what if we want to assign this number to the customer? In C/AL we would have triggers. In this example we would use the getter.


In the property we return the value of the number series. See how easy that is?

Now if we create a sample application that would create a customer we would have this


So we have a new customer with a number, that we do not declare in the class, it is automatically added, like in Dynamics NAV

What about address formatting

So we print the address, but what if I want to do that like in NAV? Then we need a new codeunit class, and we would add a method to the class, like this:


This class takes a customer as a parameter and calls into a generic function to move the address to an array. It also has a function for the Sales Invoice, a class we will use in the next blog post.

A Codeunit is a Method

In C# we would add the adressformating as a method that we can do with a class. This way we don’t have to call the addressformatting class in our programm.

Like this:


And the keyword this stands for what we would cal Rec in Dynamics NAV.

This is what it does in the program:


A Table is a Class, A Codeunit is a Method (and a class)

So a table definition (not the actual SQL table) would be a class and a codeunit too, and added to the table class.

This actually would work nice in NAV too, if we would declare things like FormatAddress on the table, we would never have to use Codeunits as a variable anymore.

Next time…

I will explain how to create a sales order in C# and how to post it to a sales invoice.

Hang on, stay tuned.