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You may have been hearing a bit about nullable types in Whidbey (a feature in both VB and C#) but you should read this post by Paul to get an explanation of what they are, how they work and why they are useful... all from a VB point of view!
The Truth about Nullable Types and VB...
There's been a little confusion about how VB's going to handle nullable types in VB 2005, so let me try and amplify a little bit on the entry on the VB team blog .
What are nullable types?
One of the primary differences between value types such as Integer or structures and reference types such as Form or String is that reference types support a null value.... (continued in the full post)