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!
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)