Solved

ASP.NET VB Export to Excel Exception

Posted on 2010-08-24
1
260 Views
Last Modified: 2012-05-10
When trying to use the following export to excel in my button.click event:  Any help ??? (Please don't send me to another tutorial.  I've been to about 25 of them already).  Note that the grid is in the content area page and I'm using Master Pages.  The grid renders correctly and populates the data correctly from my datasource

Response.Clear()

        ' Set the type and filename   
        Response.AddHeader("content-disposition", "attachment;filename=FileName.xls")
        Response.Charset = ""
        Response.ContentType = "application/vnd.xls"

        ' Add the HTML from the GridView to a StringWriter so we can write it out later   
        Dim sw As System.IO.StringWriter = New System.IO.StringWriter
        Dim hw As System.Web.UI.HtmlTextWriter = New HtmlTextWriter(sw)
        EmployeeGrid.RenderControl(hw)

        ' Write out the data   
        Response.Write(sw.ToString)
        Response.End()

Open in new window


I get this exception on the RenderControl call:

Control 'ctl00_ContentPlaceHolder1_EmployeeGrid' of type 'GridView' must be placed inside a form tag with runat=server.

Below is my grid in asp (which loads perfectly)

 <asp:GridView ID="EmployeeGrid" runat="server" AutoGenerateColumns="False" 
        DataSourceID="ObjectDataSource1" 
        CssClass="mGrid"
        AlternatingRowStyle-CssClass="alt" >
        <Columns>
            <asp:BoundField DataField="LastName" HeaderText="LastName" 
                SortExpression="LastName" />
            <asp:BoundField DataField="FirstName" HeaderText="FirstName" 
                SortExpression="FirstName" />
            <asp:BoundField DataField="EmailAddress" HeaderText="EmailAddress" 
                SortExpression="EmailAddress" NullDisplayText="---" DataFormatString="<a href=mailto:{0}>{0}</a>" HtmlEncodeFormatString="false"/>
            <asp:BoundField DataField="Location" HeaderText="Location" 
                SortExpression="Location" />
            <asp:BoundField DataField="JobTitle" HeaderText="JobTitle" 
                SortExpression="JobTitle" />
        </Columns>

<AlternatingRowStyle CssClass="alt"></AlternatingRowStyle>
    </asp:GridView> 

Open in new window

0
Comment
Question by:rwdMike
1 Comment
 

Accepted Solution

by:
rwdMike earned 0 total points
ID: 33513536
Ok, well, figured it out.  The example I used didn't include the need to override VerifyRenderinginServerForm

Public Overrides Sub VerifyRenderingInServerForm(ByVal control As Control)
    End Sub
0

Featured Post

Free Tool: Postgres Monitoring System

A PHP and Perl based system to collect and display usage statistics from PostgreSQL databases.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Just a quick little trick I learned recently.  Now that I'm using jQuery with abandon in my asp.net applications, I have grown tired of the following syntax:      (CODE) I suppose it just offends my sense of decency to put inline VBScript on a…
The article shows the basic steps of integrating an HTML theme template into an ASP.NET MVC project
The Email Laundry PDF encryption service allows companies to send confidential encrypted  emails to anybody. The PDF document can also contain attachments that are embedded in the encrypted PDF. The password is randomly generated by The Email Laundr…

808 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question