Unlock Excel file for reading in my Asp.Net MVC application

I'm developing an application in Asp.Net MVC where it will upload an Excel file generated by another system, but this file is coming blocked through reliability center file locking settings >

ThequestionishowdoIgetmyapplicationtoopenthefiletodothisunlock?

Thisisgivingerrorinthelinesbelowwhentryingtoopenfilethatisblocked.

Excel.Applicationapplication=newExcel.Application();Excel.Workbookworkbook=application.Workbooks.Open(filePath);Excel.Worksheetworksheet=workbook.ActiveSheet;Excel.Rangerange=worksheet.UsedRange;

[HttpPost]publicActionResultImportLots(HttpPostedFileBasepostedFile){if(postedFile==null||postedFile.ContentLength==0){ModelState.AddModelError(string.Empty,"Favor selecionar o arquivo de Lotes válido!");
        return View();
    }
    else
    {
        if (postedFile.FileName.EndsWith("xls") || postedFile.FileName.EndsWith("xlsx") || postedFile.FileName.EndsWith("XLS") || postedFile.FileName.EndsWith("XLSX"))
        {
            string filePath = string.Empty;
            string path = Server.MapPath("~/Uploads/");

            if (!Directory.Exists(path))
            {
                Directory.CreateDirectory(path);
            }

            filePath = path + Path.GetFileName(postedFile.FileName);

            if (System.IO.File.Exists(filePath))
            {
                System.IO.File.Delete(filePath);
            }

            postedFile.SaveAs(filePath);

            Excel.Application application = new Excel.Application();
            Excel.Workbook workbook = application.Workbooks.Open(filePath);
            Excel.Worksheet worksheet = workbook.ActiveSheet;
            Excel.Range range = worksheet.UsedRange;

            var dataAbate = DateTime.Parse(((Excel.Range)range.Cells[3, 2]).Text);

            int j = 5;
            int linhasQueContem_P = 0;
            while (((Excel.Range)range.Cells[j, 19]).Text == "P")
            {
                linhasQueContem_P++;
                j++;
            }

            for (j = 5; j < (linhasQueContem_P + 5); j++)
            {
                if(!string.IsNullOrEmpty(((Excel.Range)range.Cells[j, 1]).Text))
                {
                    var lote = int.Parse(((Excel.Range)range.Cells[j, 1]).Text);
                    var pecurista = ((Excel.Range)range.Cells[j, 2]).Text;
                    var propriedade = ((Excel.Range)range.Cells[j, 5]).Text;
                }

                var procedencia = ((Excel.Range)range.Cells[j, 9]).Text;
                var especie = ((Excel.Range)range.Cells[j, 13]).Text;
                var quantidade = ((Excel.Range)range.Cells[j, 15]).Text;
                var sequenciaInicial = ((Excel.Range)range.Cells[j, 17]).Text;
                var sequenciaFinal = ((Excel.Range)range.Cells[j, 18]).Text;
            }

            workbook.Close();
        }
        else
        {
            ModelState.AddModelError(string.Empty, "Arquivo " + Path.GetExtension(postedFile.FileName) + " não é válido!");
            return View();
        }
    }

    return View();
}