Shell Commands using Process Info in System.Diagnostics

Hey experts,

I'm writing a simple program in C# to loop through an XML file and execute commands one after the other on a machine. The primary purpose of this application is to automated a number of deployment steps.

I'm using ProcessInfo and Process in the .NET library and using C# as the language.

Problem:
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I'm unable to execute DOS/Shell commands using ProcessInfo object. Simple exe's, bat's etc work, but when trying o execute a system specific shell command doesn't work.

Examples:
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As an example:

1. Install.exe C:\Program Files\..... works
2. del c:\Program Files\....\abcd.txt doesn't work

So my question is:

How do you execute such DOS commands like del, dir etc using the System.Diagnostics classes in .NET.

I'm open to other namespaces as well in .NET as well as other free tools to get the job done.