Convert GridView To Excel (Error)

Aug 11, 2011

I have what would seem like a fairly straightforward task: Export a report (GridView) to a spreadsheet, so that the client (user) can use the data elsewhere. I thought I found a very elegant solution. Here is the code:

Code:
Protected Sub btnWrite2Exell_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnWrite2Exell.Click
Response.Clear()
Response.AddHeader("content-disposition", "attachment; filename=FileName.xls")
Response.Charset = ""

[Code] ...

With a little putsing I got it to work, which is good, EXCEPT that it precedes opening the spreadsheet with a warning that looks like this:

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