How to avoid a Win32 exception when accessing Process.MainModule.FileName in C#?

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Please see Jeff Mercado’s answer here.

I adapted his code slightly to just get the filepath of a specific process:

string s = GetMainModuleFilepath(2011);

. 

private string GetMainModuleFilepath(int processId)
{
    string wmiQueryString = "SELECT ProcessId, ExecutablePath FROM Win32_Process WHERE ProcessId = " + processId;
    using (var searcher = new ManagementObjectSearcher(wmiQueryString))
    {
        using (var results = searcher.Get())
        {
            ManagementObject mo = results.Cast<ManagementObject>().FirstOrDefault();
            if (mo != null)
            {
                return (string)mo["ExecutablePath"];
            }
        }
    }
    return null;
}

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