Here's the sad fact, if you are going to work with VB.Net, you should learn the language
. Once you convert the code, you will need to know how to fix that parts that won't work the same way, and you will need to know how to maintain the code.
There is no "free" paste your code here get VB.Net code back solution. However, it's really not all that bad. There are resources out there that will help you in converting (Read... rewriting) your code to VB.Net.
Here is a good resource you can refer to:
They even have a free e-book you can download.
Go get 'em! You will be a better programmer in the end for having done this..