ASP.Net中的“另存为”对话框，用于导出Excel文件？ （服务帐户）

Question

I have a code working for saving the exported file into my PC/Destination however since the ASP.NET (4.0) will be displayed in a server running a service account, i would like to let the user after he clicks the button1 to prompt "Save as" dialog so they can save it in their respective folder ( In the user's PC, not server ). (i can not use environment since it will grab the service account address, since this is in the server its not possible.)

Note: to get the user name i'm using request.servervariables("Logon_User") and did look for some posts here. - Exporting datatable to excel file with save dialog - Export DataGridView To Excel with Save Dialog? - Dialog Box for Save As location in VBA Macro

Dim cnn As SqlConnection
    Dim connectionString As String
    Dim sql As String
    Dim i, j As Integer

    Dim xlApp As Excel.Application
    Dim xlWorkBook As Excel.Workbook
    Dim xlWorkSheet As Excel.Worksheet
    Dim misValue As Object = System.Reflection.Missing.Value

    xlApp = New Excel.Application
    xlWorkBook = xlApp.Workbooks.Add(misValue)
    xlWorkSheet = xlWorkBook.Sheets("sheet1")

    connectionString = "Data Source=xxxx"
    cnn = New SqlConnection(connectionString)
    cnn.Open()
    sql = "SELECT * FROM ControlCharts"
    Dim dscmd As New SqlDataAdapter(sql, cnn)
    Dim ds As New DataSet
    dscmd.Fill(ds)

    For i = 0 To ds.Tables(0).Rows.Count - 1
        For j = 0 To ds.Tables(0).Columns.Count - 1
            xlWorkSheet.Cells(i + 1, j + 1) = _
            ds.Tables(0).Rows(i).Item(j)
        Next
    Next

    'here instead of saving it to the C drive, let the user choose.
    xlWorkSheet.SaveAs("C:\\ControlCharts.xlsx")
    xlWorkBook.Close()
    xlApp.Quit()
    releaseObject(xlApp)
    releaseObject(xlWorkBook)
    releaseObject(xlWorkSheet)
    cnn.Close()
    CheckBox1.Checked = False

Answer 1

You cannot have the user interact with UI and filesystem on the server.

Instead, you can save the file to a temporary path on the server, then serve it as a file download over HTTP.