Running external zip utility - command line error

I’ve been attempting to launch a zip utility from C#.NET code.  Unfortunately, the 7-Zip utility that I’m using doesn’t like the command line string that I’m passing in.  Without getting into the switch syntax for this utility, I can tell you that the command line in the code below works when the utility is launched from the command prompt, so no problem there.

Here’s the sample code:

using System.Diagnostics;

private void btnZipMe_Click(object sender, System.EventArgs e)
    string strCmdLine = @"7z a -tzip c:\backups\ \a\*.doc";        
    ProcessStartInfo psi = new ProcessStartInfo();

    psi.FileName = @"C:\Program Files\7-Zip\7zG.exe";
    psi.Arguments = strCmdLine;
    Process p = Process.Start(psi);

When the last line of code above executes, the external utility pops up a message box stating “Incorrect command line” . Additionally, just as a test, I also set up everything under my C: drive to avoid escape characters even though the literal symbol should handle that – same error. Any ideas?

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watch out for the \ escaping \. I mean use \\ instead of \

Mike TomlinsonMiddle School Assistant TeacherCommented:
Shot in the dark...

Try setting the Working directory and starting it this way:

        Process p = new Process();
        p.StartInfo.FileName = @"C:\Program Files\7-Zip\7zG.exe";
        p.StartInfo.Arguments = @"7z a -tzip c:\backups\ \a\*.doc";
        p.StartInfo.WorkingDirectory = @"C:\Program Files\7-Zip\";

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And another run at it...

  private void btnZipMe_Click(object sender, System.EventArgs e)
    ProcessStartInfo psi = new ProcessStartInfo();
    psi.FileName = @"C:\Program Files\7-Zip\7z.exe";
    psi.Arguments = @"a -tzip ""c:\backups\"" ""c:\FULL_PATH\a\*.doc""";
    Process p = Process.Start(psi);
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