How to open a specific file with VS2008 automatically

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C#

WinForms

Ok so I have a windows Form with a button on it to open VS2008 for me which it does, but I want to extend the function now to open a specific file at the same time in VS2008

private void btnReport_Click(object sender, EventArgs e)
        {
            Process openVisualStudio2008 = new Process();
            openVisualStudio2008.StartInfo.FileName = @"C:\Program Files (x86)\Microsoft Visual Studio 9.0\Common7\IDE\devenv.exe";
            openVisualStudio2008.Start();
        }