Running powershell script in separate Process with arguments

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PowerShell

process

I am trying to invoke a powershell script string in a separate process but seems like I am not getting any argument passed to the script. Is there a way to invoke powershell script in a separate process

private static void InvokeScript(int arguments)
     {
         Process p = new Process();
         p.StartInfo.FileName = "powershell.exe";
         p.StartInfo.Arguments = String.Format("{0}\"\"{1}\"\"", update, arguments);
         p.StartInfo.RedirectStandardOutput = true;
         p.StartInfo.RedirectStandardError = true;
         p.StartInfo.UseShellExecute = false;
         p.Start();
         var output = p.StandardOutput;
         var error = p.StandardError;
         string result = output.ReadToEnd();
         string errorstring = error.ReadToEnd();
         p.WaitForExit();
     }

 private const string update = @"
try
{    
    return $($args.count)
}
catch
{
    return $_.Exception.Message
}";