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Gridview - Excel error

Posted on 2011-02-15
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Last Modified: 2012-06-21
When I tried to export Gridview to Excel file, I got this error. Is this because of Itemtemplate?

Control 'GridView1_ctl14_ctl02' of type 'DataControlLinkButton' must be placed inside a form tag with runat=server.



   <asp:TemplateField HeaderText="ModifiedDate">
                                    <ItemTemplate>
                                        <asp:HyperLink ID="HyperLink1" runat="server"
                                            navigateurl='<%# string.format("test.aspx?dateordered={0}", Databinder.Eval(container.Dataitem, "dateordered", "{0:yyyy-MM-dd HH:mm:ss.fff}")) %>'
                                            text='<%# Databinder.Eval(container.dataitem, "ModifiedDate", "{0:yyyy-MM-dd HH:mm:ss.fff}") %>'></asp:HyperLink>
                                    </ItemTemplate>
                                </asp:TemplateField>  
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Question by:VBdotnet2005
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4 Comments
 
LVL 36

Expert Comment

by:Miguel Oz
ID: 34900336
NOt really but it depends how your code is structured,check:
Are you following th esame steps of this link to do your export?
http://www.c-sharpcorner.com/uploadfile/dipalchoksi/exportxl_asp2_dc11032006003657am/exportxl_asp2_dc.aspx

If more help required you must post your export excel code.
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Author Comment

by:VBdotnet2005
ID: 34900935
this is my code to export to Excel

 Dim hf As New HtmlForm()
        Dim GridView2 As GridView = Me.GridView1
        hf.Controls.Add(GridView2)

        Response.Clear()
        Response.Buffer = True
        Response.ContentType = "application/vnd.ms-excel"
        Response.Charset = ""
        Me.EnableViewState = False
        Dim oStringWriter As New System.IO.StringWriter
        Dim oHtmlTextWriter As New System.Web.UI.HtmlTextWriter(oStringWriter)
        GridView2.RenderControl(oHtmlTextWriter)
        Response.Write(oStringWriter.ToString())
        Response.[End]()
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Author Comment

by:VBdotnet2005
ID: 34901952
i added gridview1.databind . that works, but why do I get this error?
ee.bmp
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LVL 36

Accepted Solution

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Miguel Oz earned 2000 total points
ID: 34902187
You are not rendering the gridview properly:
For starters, your posted code:
- No need an html form or Gridview2 reference.
- No attachment defined

Your code should look like:
        Dim attachment As String = "attachment; filename=YourFilename.xls"
        Response.ClearContent()
        Response.AddHeader("content-disposition", attachment);
        Response.ContentType = "application/vnd.ms-excel"
        Dim oStringWriter As New System.IO.StringWriter
        Dim oHtmlTextWriter As New System.Web.UI.HtmlTextWriter(oStringWriter)
        Me.GridView1.RenderControl(oHtmlTextWriter)
        Response.Write(oStringWriter.ToString())
        Response.End()

P.S. Read the instructions on the link, it is straight forwards. You may need to implement your own PrepareGridViewForExport in the button that starts export. I know the code is C# but it is easy to translate (do not forget to add vb.net zone next time - you can specify up to 3 zones)
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