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.NET Forum / ASP.NET / General / June 2007

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Exporting Datagrid to Excel (unable to read file)

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John Walker - 20 Jun 2007 18:02 GMT
Hi,
Is there anything wrong with the code below in sending my browser page to
Excel?  Before my page opens in Excel there's a message "Problems came up in
the following areas during load:" and it shows a CSS file in the "temporary
internet files" path.  But when i click OK the page displays beautifully.  
Even though my page has 3 datagrids, they all display with the same style as
seen in the browser page.

Though, the second problem is, when i try to export a datagrid which has
many rows, it will not export at all and a popup "unable to read file"
displays and Excel just shows gray blankness.  Here is the code that i'm am
using:

   Public Shared Sub ExportToExcel(ByVal argDG As DataGrid, ByVal argPage
As Page)

       Dim resp As HttpResponse
       resp = argPage.Response
       resp.ContentType = "application/download"
       resp.AppendHeader("Content-Disposition",
"attachment;filename=GLdata.xls")
       Dim colHeaders As String

       Dim tw As New System.IO.StringWriter
       Dim hw As New System.Web.UI.HtmlTextWriter(tw)

       argDG.RenderControl(hw)

   End Sub
David Wier - 20 Jun 2007 19:36 GMT
As far as the row count - I believe there is a limit of around 65,000 rows
for Excel - - how many rows need to be exported?

Signature

David Wier
MVP/ASPInsider
http://aspnet101.com
http://iWritePro.com

> Hi,
> Is there anything wrong with the code below in sending my browser page to
[quoted text clipped - 29 lines]
>
>    End Sub
David Wier - 20 Jun 2007 19:37 GMT
check out this code sample at ASPNet101.com:
http://www.aspnet101.com/aspnet101/aspnet/codesample.aspx?code=ExportDGExcel

Signature

David Wier
MVP/ASPInsider
http://aspnet101.com
http://iWritePro.com

> Hi,
> Is there anything wrong with the code below in sending my browser page to
[quoted text clipped - 29 lines]
>
>    End Sub
John Walker - 20 Jun 2007 22:19 GMT
Thank you!  that helped - i wasnt setting EnableViewState to False, so that
solved my "unable to read file" problem.

But, i'm still getting the problem of a prompt window saying that it cant
find the CSS file... is there a way to not have it prompt?  i dont care if it
cant find the CSS, i just dont want the user to have to click ok.

> check out this code sample at ASPNet101.com:
> http://www.aspnet101.com/aspnet101/aspnet/codesample.aspx?code=ExportDGExcel
[quoted text clipped - 32 lines]
> >
> >    End Sub

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