Which question are you asking?
How do I access VBScript functions from CSharp?
or
How do I access CSharp functions from VBScript?
VBScript is not .NET. Therefore in order to consume methods in the VBScript you'll need to either convert the VBScript to
VB.NET or call the functions in the VBScript file thru the wscript interpreter thru an external process call. I'd highly recommend going with the conversion route.
If you want to consume C# from VBScript you could compile the C# classes to an assembly and register that for interopreability with COM. Then you could consume the .NET classes thru COM functionality in VBScript.
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Peter