It is likely that the "example" code using their API is written in VB, however .Net does not care what language you use.
This means that you can reference their assemblie and use any .Net compliant language(F#, C# etc.) You do not ever need to code any VB.
Create a solution/project as you would normally (C# I assume) and then reference the dlls. You can then use their API with C# notation.
If you are stuck on their provided examples you can convert them using an online
converter[
^].