A problem in viewing Excel file

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ASP.NET

MS-Excel

Hi,

I have developed an ASP.Net project in which I want to produce some excel reports.

When I run this program on my local system, there is no problem in viewing those excel files, but after putting that software on server (Windows Server 2003 r2) I can not view the reports and I get the following error:

Microsoft Office Excel cannot open or save any more documents because there is not enough available memory or disk space.
• To make more memory available, close workbooks or programs you no longer need.
• To free disk space, delete files you no longer need from the disk you are saving to.

my code is here:

Microsoft.Office.Interop.Excel.Application oXL;
        Microsoft.Office.Interop.Excel.Workbook oWB;
        Microsoft.Office.Interop.Excel.Worksheet oSheet;
        Microsoft.Office.Interop.Excel.Range oRange;
oXL = new Microsoft.Office.Interop.Excel.Application();
        
        //oXL.Visible = false;

        //Get a new workbook
        oWB = (Microsoft.Office.Interop.Excel.Workbook)(oXL.Workbooks.Add(System.Reflection.Missing.Value));
        oSheet = (Microsoft.Office.Interop.Excel.Worksheet)oWB.ActiveSheet;

        #endregion

        #region Styles

        Microsoft.Office.Interop.Excel.Style style_Header = null;//Reports_Header_Style_Func(oWB);
        Microsoft.Office.Interop.Excel.Style style_Titles = null; //Reports_Columns_Title_Style_Func(oWB);

        #endregion

        #region Columns_Titles

        string[,] _Titles = new string[1, 10];

        _Titles[0, 0] = "Product";
        _Titles[0, 1] = "Product(U)";
        _Titles[0, 2] = "Manufact";
        _Titles[0, 3] = "Price(U)";
        _Titles[0, 4] = "Daily Usd";
        _Titles[0, 5] = "Daily Rec";
        _Titles[0, 6] = "Daily Ret";
        _Titles[0, 7] = "Stock";

        #endregion

        #region Report_Building

        #region Header

        oRange = oSheet.get_Range("A1", "H1");
        oRange.Cells[1, 1] = "Materials Used In Well: " + _wellName + " In Date: " + _fDate.ToString();
        oRange.Merge(System.Reflection.Missing.Value);
        oRange.Style = style_Header;

        #endregion

        #region Titles

        oRange = oSheet.get_Range("A2", "H2");
        oRange.Value2 = _Titles;
        oRange.Style = style_Titles;

        #endregion

        int i = 3;
        foreach (var item in Bll_obj_Material.Get_Materials_By_WellObjCodeandfDate(_wellObjCode, _fDate))
        {
            oSheet.Cells[i, 1] = item.Product.Product1;
            oSheet.Cells[i, 2] = item.ProductUnit.ProductUnit1;
            oSheet.Cells[i, 3] = item.ProductManufacture;
            oSheet.Cells[i, 4] = item.PriceUnit.PriceUnit1;
            oSheet.Cells[i, 5] = item.DailyUsed;
            oSheet.Cells[i, 6] = item.DailyRec;
            oSheet.Cells[i, 7] = item.DailyReturn;
            oSheet.Cells[i, 8] = (item.StartAmount + item.DailyRec) - (item.DailyReturn + item.DailyUsed);
            i++;
        }

        oSheet.Columns.AutoFit();

        int max_row = i - 1;
        string max_index = "H" + max_row.ToString();

        oRange = oSheet.get_Range("A1", max_index);
        oRange.Borders.Weight = 2;

        oRange = oSheet.get_Range("A2", max_index);
        oRange.Font.Size = 8;

        oRange = oSheet.get_Range("A1", "H1");
        oRange.Font.Size = 9;

        #endregion

        #region Save_and_Open_Report

        string _fileName = "Material_Report_of_" + _wellName + "(" + DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + ")" + ".xls";

        string _savePath = Server.MapPath("~") + "\\ExcelReports\\" + _fileName;

        oWB.SaveCopyAs(_savePath);

        string _openPath = Request.ApplicationPath;

        _openPath = _openPath + "/ExcelReports/" + _fileName;

        HyperLink_TEMP.NavigateUrl = _openPath;

        HyperLink_TEMP.Visible = true;

        HyperLink_TEMP.Text = "Download Generated Report";

        
        #endregion

Thanks a lot in advance!