//Instantiate the Application object.
            Excel.Application excelApp = Application;

            //Specify the template excel file path.
            string myPath = "Get Text of Specific Cell.xlsx";

            //Open the excel file.
            Microsoft.Office.Interop.Excel.Workbook ThisWorkbook = excelApp.Workbooks.Open(myPath, Missing.Value, Missing.Value,
                  Missing.Value, Missing.Value,
                  Missing.Value, Missing.Value,
                  Missing.Value, Missing.Value,
                  Missing.Value, Missing.Value,
                  Missing.Value, Missing.Value,
                  Missing.Value, Missing.Value);

            String res = "";
            res = ThisWorkbook.Worksheets["Sheet1"].Range("A1").Text;

            MessageBox.Show(res);

            //Save the file.
            excelApp.ActiveWorkbook.Save();

            excelApp.Quit();

//Specify the excel file path.
            string myPath = "Get Text of Specific Cell.xlsx";

            //Instantiating a Workbook object
            Workbook workbook = new Workbook(myPath);

            //Get worksheet
            Worksheet worksheet = workbook.Worksheets[0];

            String res = "";
           res= worksheet.Cells["A1"].Value.ToString();

           Console.Write(res);

           Console.ReadKey();