ASP.NET web application I Can’t Access after IIS hosting‏

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C#

ASP.NET

IIS7.5

I have to read an exist excel sheet values and generate text format report using Microsoft.Office.Interop.Excel namespace, when I deploy an ASP.NET web application on IIS 7.5 at windows server 8 r2 I can't access that event after IIS hosting but when I run local machine it'll working fine... kindly give me the solution on this problem? Following my aspx.cs code.

using System.Data;
using System.Reflection;
using System.Text;
using System.IO;
using Microsoft.Office.Interop.Excel; 

public void GetTextValue()
    {

        string sUploadFilePath = string.Empty;
        sUploadFilePath = Server.MapPath(".") + @"\Report\GAD_Model_Template_keivsan1_D2038_00.xls";

        DataSet ds = new DataSet();

        //Office Application Object Declaretion

        Microsoft.Office.Interop.Excel.Application oXL = null;

        //Office workbook object  Declaretion

        Microsoft.Office.Interop.Excel.Workbook oWB = null;

        //Office Worksheet object  Declaretion

        Microsoft.Office.Interop.Excel.Worksheet oSheet = null;

        //Office Range object  Declaretion

        Microsoft.Office.Interop.Excel.Range oRng = null;

        try
        {

            //Create an Application object                   

            oXL = new Microsoft.Office.Interop.Excel.Application();

            //Getting a WorkBook object

            oWB = oXL.Workbooks.Open(sUploadFilePath, 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);
            //Getting a WorkSheet object                   

            oSheet = (Microsoft.Office.Interop.Excel.Worksheet)oWB.Sheets["OUTPUT"];

            //Datatable with dtExcel Name

            System.Data.DataTable dt = new System.Data.DataTable("dtExcel");

            ds.Tables.Add(dt);

            DataRow dr;

            StringBuilder sb = new StringBuilder();

            //Total Column Count

            int jValue = oSheet.UsedRange.Cells.Columns.Count;

            //Total Row count   

            int iValue = oSheet.UsedRange.Cells.Rows.Count;

            for (int j = 1; j <= jValue; j++)
            {

                dt.Columns.Add("column" + j, System.Type.GetType("System.String"));

            }

            //Getting Data in Cell                   

            for (int i = 1; i <= iValue; i++)
            {

                dr = ds.Tables["dtExcel"].NewRow();

                for (int j = 1; j <= jValue; j++)
                {

                    oRng = (Microsoft.Office.Interop.Excel.Range)oSheet.Cells[i, j];

                    string strValue = oRng.Text.ToString();

                    dr["column" + j] = strValue;

                }

                ds.Tables["dtExcel"].Rows.Add(dr);

            }

            //Release the Excel objects                

            oWB.Close(false, System.Reflection.Missing.Value, System.Reflection.Missing.Value);

            oXL.Workbooks.Close();

            oXL.Quit();

            oXL = null;

            oWB = null;

            oSheet = null;

            oRng = null;

            GC.GetTotalMemory(false);

            GC.Collect();

            GC.WaitForPendingFinalizers();

            GC.Collect();

            GC.GetTotalMemory(true);

            //Release the Excel objects          

            StringBuilder commaDelimitedText = new StringBuilder();
            commaDelimitedText.AppendLine("GAD Inputs");
            foreach (DataRow row in ds.Tables["dtExcel"].Rows)
            {
                string value = string.Format("{0}", row[0]); // how you format is up to you (spaces, tabs, delimiter, etc)
                commaDelimitedText.AppendLine(value);
            }

            File.WriteAllText("" + Server.MapPath(".") + @"\Report\" + "GADoutput" + ".txt" + "", commaDelimitedText.ToString());
            string txtfilepath = Server.MapPath(".") + @"\Report\" + "GADoutput" + ".txt";
            Session["filepath"] = txtfilepath;

            ScriptManager.RegisterStartupScript(this, typeof(string), "SITE", "alert('Text File write successfully!');", true);
        }
        catch (Exception ex)

        { }

        //return ds;
    }

Thanks and regards,

Parthiban K.