get full path from process in c#

Question

private void btnFixLogin_Click(object sender, EventArgs e)
{
    var lines = File.ReadAllLines("listprocess.txt").Where(arg => !string.IsNullOrWhiteSpace(arg));
    var listProcess = Process.GetProcesses().Where(x => lines.Contains(x.ProcessName.ToLower())).ToList();
    if (listProcess.Count == 0) {
        MessageBox.Show("Wrong config.", "Thông báo", MessageBoxButtons.OK, MessageBoxIcon.Error);
        return;
    }
    RetartListProcess(listProcess);
}

private void RetartListProcess(List<Process> listProcess)
{
    foreach (var process in listProcess)
    {
        var idprocess = process.Id;
        var fullname = GetMainModuleFilepath(idprocess);
        process.Kill();
        process.WaitForExit();
        Process.Start(fullname);
        Thread.Sleep(100);
    }
}

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;
}