Execute excel as another process

void ExecuExcelAsAnotherProcess()
{
    string excelProcessPath = "";
    string fileName = @"C:\Users\Administrator\Downloads\Test.xlsx_";
    try
    {
        this.Cursor = Cursors.WaitCursor;
 
        excelProcessPath = GetExcelProcessPath();
 
        string cmd = string.Format(""{0}" /x "{1}"", excelProcessPath, fileName);
 
        System.Diagnostics.ProcessStartInfo psInfo = new System.Diagnostics.ProcessStartInfo(cmd);
        psInfo.CreateNoWindow = false;
        psInfo.UseShellExecute = false;
        using (System.Diagnostics.Process ps = System.Diagnostics.Process.Start(psInfo))
        {
            ps.EnableRaisingEvents = true;
            ps.WaitForExit();
        }
    }
    finally
    {
        this.Cursor = Cursors.Default;
    }
}
 
string GetExcelProcessPath()
{
    dynamic app = null;
    try
    {
        Type excelType = Type.GetTypeFromProgID("Excel.Application");
        app = Activator.CreateInstance(excelType);
        app.Visible = true;
        app.DisplayAlerts = true;
 
        return Path.Combine(app.Path, "excel.exe");
    }
    finally
    {
        if (app != null)
        {
            app.Quit();
        }
        NAR(app);
    }
 
}
 
void NAR(object obj)
{
    try
    {
        if (obj != null)
        {
            System.Runtime.InteropServices.Marshal.ReleaseComObject(obj);
        }
    }
    catch { }
    finally
    {
        obj = null;
    }
}