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    <p>In .NET, there is a distinct concept between reference types and value types.</p> <p>A reference type is an object that is allocated on the heap (It will be a subclass of System.Object). All that is on the stack is a pointer to this object. Because of that, it is perfectly valid to store a null pointer.</p> <p>A value type is an object that is allocated on the stack, it will be a subclass of System.ValueType. Because a value type lives on the stack, when you pass its value to a function, you pass the entire contents of the object. </p> <p>Value types cannot be null.</p> <p>Most C# primitive types are value types. String is a special type of primitive that is actually a reference type.</p> <p>In .NET 2.0, MS added the ability to enclose a generic type inside of a struct so that it could simulate a nullable type. What really happens is that the logic inside of the Nullable&lt;T&gt; struct is emulating a null for you.</p> <p>They expressed it using a syntax shortcut by adding a question mark to the type, for example:</p> <pre><code>int? nullableInt = null; float? nullableFloat = null; </code></pre> <p>etc...</p> <p>If you don't like the int? syntax, you can always use Nullable&lt;SomeType&gt;</p> <pre><code>public String getBar(Int32 a, String b, Nullable&lt;Int32&gt; c) </code></pre> <p>As a side note, I prefer to add an overload when doing what you are doing, just to make the syntax nicer.</p> <pre><code>public String getBar(Int32 a, String b) { this.getBar(a,b,null); } public String getBar(Int32 a, String b, Nullable&lt;Int32&gt; c) { } </code></pre>
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    1. COThis is a great answer. I come back to it every now and then.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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