Open a excel file in web browser

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ASP.NET

Hi All...
am using asp.net-2 i want to open a excel file in the web browser when Print Button Click hear my code....
it couldnt open in setup file when i configure in localhost

Protected Sub btn_print_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btn_print.Click
        Dim a As String = ""
        Dim dsExport As New DataSet()
        Dim tw As New System.IO.StringWriter()
        Dim hw As New System.Web.UI.HtmlTextWriter(tw)
        Dim dgGrid As New DataGrid()
        Dim xlWorkBook As Excel.Workbook
        Dim xlApp As Excel.Application = New Excel.Application
        'Dim xls As Excel.Worksheet
        xlWorkBook = New Excel.Application().Workbooks.Add(True)
        xlWorkBook.Application.Visible = False

        Dim xls As Excel.Worksheet = CType(xlWorkBook.Worksheets(1), Excel.Worksheet)
        xls = xlWorkBook.ActiveSheet

 xls.Cells(3, 1) = ("Materials Received Note")
        xls.Range("A3").Resize(1, 9).Cells.HorizontalAlignment = 3
        xls.Range("A3").Resize(1, 9).Cells.MergeCells = True
        xls.Cells(3, 1).font.size = 18
        xls.Cells(3, 1).font.Bold = False
         :
         :
         :


    xls.Range("G17", "G39").Columns.AutoFit()
        xls.Range("A17", "A39").Columns.AutoFit()
        xls.Range("D11", "D15").Columns.AutoFit()
        xls.Range("A11", "B15").Columns.AutoFit()
        xls.Range("I11", "I15").Columns.AutoFit()