C# - cmd problem, doesn't set working directory

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C#

cmd

When i try to execute a command line from a cmd.exe process, it doesn't work.

This is my code:

public static String _getIntegrityVersion()
{
    string _version = string.Empty;

    if (Directory.Exists("C:\\Program Files (x86)\\Integrity\\") == true)
    {
        DirectoryInfo _root = new DirectoryInfo("C:\\Program Files (x86)\\Integrity\\");
        DirectoryInfo[] dir = _root.GetDirectories();

        foreach (DirectoryInfo s in dir)
        {
            if (s.Name.Contains("IntegrityClient") == true)
            {
                _version = s.Name.Substring(15);
                break;
            }
        }
    }

    return _version;
}


public static string _searchVersionOfFile(FileInfo file)
{
    string _versionIntegrity = _getIntegrityVersion();

    Process cmd = new Process();
    cmd.StartInfo.WorkingDirectory = "C:\\Program Files (x86)\\Integrity\\" + "IntegrityClient" + _versionIntegrity + "\\bin\\";
    cmd.StartInfo.FileName = "cmd.exe";
    cmd.StartInfo.RedirectStandardInput = true;
    cmd.StartInfo.RedirectStandardOutput = true;
    cmd.StartInfo.CreateNoWindow = true;
    cmd.StartInfo.UseShellExecute = false;

    cmd.Start();

    string _versionOfFile = string.Empty;
    cmd.StandardInput.WriteLine("si rlog --fields=workingrev --sandbox=" + file.Directory.Name + "\\project.pj " + file.FullName);

    cmd.StandardInput.Flush();
    cmd.StandardInput.Close();

    string s = string.Empty;

    List<string> lines = new List<string>();

    while ((s = cmd.StandardOutput.ReadLine()) != null)
    {
        lines.Add(s);
    }
    lines.Reverse();

    for (int i = 0; i < lines.Count(); i++)
        if (lines[i].Contains("=========") == true)
        {
            _versionOfFile = lines[i + 1];
            break;
        }


    cmd.WaitForExit();
    return _versionOfFile;
}

What I have tried:

Anything i've founded on internet, google, developers forums.
Nothing worked ... I need to run this cmd.exe from the specified directory ( the one from working directory) and it doesn't run from there... And i do not want to make a cmd there and run it every single time ... It's not the solution i need !