vb.net to c# translator?

No, there isn't.  There are some that claim to do this but in reality you will find that you will need to do much of it by hand.  Some of things that you can get away with VB you cannot in C# and in attempting to translate from VB to C# you will find these things will fall apart in the translated version.

For example, in VB you can get away with looping through a collection using a dictionary entry and if you have an object stored in the value side of the collection and know what property you want to access, you can do it directly, e.g.:

txtSomeProperty.Text = de.Value.SomeProperty.ToString();

In C#, you can't do that, to do that same thing you'd need to do something like this:

txtSomeProperty.Text = ((TheClass)(de.Value)).SomeProperty.ToString();

I have not seen a translater yet that will fix that one.