You could try using the Excel COM objects to read in CSV files, but that is probably overkill, and if you have a large CSV file, very slow...
If you are never going to have quoted strings in the CSV file a simple string split on the comma would work.
In C# that would be something like:
string s = "1033, 23.98, .1234, .5678";
string fields = s.Split(',');
I'm assuming that the VB.Net and C#.Net strings have pretty similar methods and properties here, so you should be able to translate that into VB.Net without too much trouble. You may also need to trim whitespace off of each element in the array before using it using the Trim() method.