Shell Command in vb.net

I had a program which will convert the content of text file into a desired format and inorder to run this pro we need to pass in input filename paramter and keyword /p and will generate a txt in the working ditector. I have excecuted the below syntax in command prompt and the conversion works fine.

CD C:\Program Files

CD My Converter

C:\ProgramFiles\MyConverter>Converter /p c:\test2.txt

Conversion sucessful

VB.net code


        Dim stemp As String
        stemp = "cmd /c c:\Program Files\MyConverter\Converter.exe /p " + "c:\test2.txt "
        Shell(stemp)
 
But .net code does nt work..What seems to be the problem lately. Experts, pls advice.