Issue when hosting on server

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C#

private static Microsoft.Office.Interop.Excel.Workbook mWorkBook;
 private static Microsoft.Office.Interop.Excel.Sheets mWorkSheets;
 private static Microsoft.Office.Interop.Excel.Worksheet mWSheet1;
 private static Microsoft.Office.Interop.Excel.Application oXL;
 public void ReadExistingExcel()
 {
    // string path = @"F:\\tempExcel.xls";
     string fileName = "../Admin/Excel/tempExcel.xls";
     string path = Server.MapPath(fileName);

     oXL = new Microsoft.Office.Interop.Excel.Application();
     oXL.Visible = true;
     oXL.DisplayAlerts = false;
     mWorkBook = oXL.Workbooks.Open(path, 0, false, 5, "", "", false, Microsoft.Office.Interop.Excel.XlPlatform.xlWindows, "", true, false, 0, true, false, false);
     //Get all the sheets in the workbook
     mWorkSheets = mWorkBook.Worksheets;
     //Get the allready exists sheet
     mWSheet1 = (Microsoft.Office.Interop.Excel.Worksheet)mWorkSheets.get_Item("Sheet1");
     Microsoft.Office.Interop.Excel.Range range = mWSheet1.UsedRange;
     int colCount = range.Columns.Count;
     int rowCount = range.Rows.Count;
     for (int index = 1; index < 15; index++)
     {
         mWSheet1.Cells[rowCount + index, 1] = rowCount + index;
         mWSheet1.Cells[rowCount + index, 2] = "New Item" + index;
     }

 }

I have used this code in my web application in asp.net. For that i include an dll file microsoft.office.interop.excel.dll. It is working fine in local . But when hosting online it shows error.Please help me..

What I have tried:

Once i removed the following line from web config
<add assembly="stdole, Version=7.0.3300.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A">
the site is working but cant read and write on excel