Does the bindgrid & the render control have to be done in a new page?
i.e. - in my buttonclick event, I'd transfer control to page2.aspx (via a
response.redirect), and in page2.aspx, I'd have a bindgrid & a render
control routine (similar to what I have in the selectindexchanged sub
below). But that would be all I'd have in my page2.aspx.
What I don't know is (1) if this would fix my problem, and (2) how do you
get the data results (in my case probably a meg's worth of data) into the
new page?
The code I'm looking at is this:
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
BindGrid()
RenderGrid()
End Sub
Private Sub BindGrid()
Dim dtResults As DataTable = CType(Session("DynamicFormResults"),
DataTable)
If Not dtResults Is Nothing Then
DataGrid1.DataSource = dtResults.DefaultView
DataGrid1.DataBind()
End If
End Sub
Private Sub RenderGrid()
Response.ContentType = "application/vnd.ms-excel"
' Remove the charset from the Content-Type header.
Response.Charset = ""
' Turn off the view state.
Me.EnableViewState = False
Dim tw As New System.IO.StringWriter
Dim hw As New System.Web.UI.HtmlTextWriter(tw)
' Get the HTML for the control.
DataGrid1.RenderControl(hw)
' Write the HTML back to the browser.
Response.Write(tw.ToString())
' End the response.
Response.End()
End Sub
which is located here:
http://weblogs.asp.net/dneimke/archi.../27/63348.aspx
Anyone have any ideas?
SC
<me@privacy.net> wrote in message
news:%2****************@TK2MSFTNGP12.phx.gbl...
The following code:
Private Sub ClearControls(ByVal ctrl As Control)
Dim i As Int32
For i = ctrl.Controls.Count - 1 To 0 Step -1
ClearControls(ctrl.Controls(i))
Next
If ctrl.GetType().ToString() <> "TableCell" Then
If Not ctrl.GetType().GetProperty("SelectedItem") Is Nothing Then
Dim literal As LiteralControl = New LiteralControl()
ctrl.Parent.Controls.Add(literal)
Try
literal.Text =
CType(ctrl.Controls.GetType().GetProperty("Selecte dItem").GetValue(ctrl,
Nothing), System.String)
Catch
End Try
ctrl.Parent.Controls.Remove(ctrl)
End If
Else
Dim literal As LiteralControl = New LiteralControl()
ctrl.Parent.Controls.Add(literal)
literal.Text =
CType(ctrl.Controls.GetType().GetProperty("Text"). GetValue(ctrl, Nothing),
System.String)
ctrl.Parent.Controls.Remove(ctrl)
End If
Return
End Sub
Private Sub RbtnExport_SelectedIndexChanged(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles RbtnExport.SelectedIndexChanged
Dim sFile As String = Session("User") & "-Customer List-" & Today()
sFile = sFile.Replace("/", "-")
ClearControls(DataGrid1)
Select Case RbtnExport.SelectedItem.Value
Case "Excel"
Response.ContentType = "application/vnd.ms-excel"
Response.AppendHeader("content-disposition", "attachment; filename=" &
sFile & ".xls")
Case "Word"
Response.ContentType = "application/vnd.ms-word"
Response.AppendHeader("content-disposition", "attachment; filename=" &
sFile & ".doc")
End Select
' Remove the charset from the Content-Type header.
Response.Charset = ""
' Turn off the view state.
Me.EnableViewState = False
Dim tw As New System.IO.StringWriter()
Dim hw As New System.Web.UI.HtmlTextWriter(tw)
' Get the HTML for the control.
DataGrid1.RenderControl(hw)
' Write the HTML back to the browser.
Response.Write(tw.ToString())
' End the response.
Response.End()
End Sub
I have as you see above EXACTLY in 2 separate aspx pages. One provides a
list of products and inventories, the other displays a list of customers.
The code above is copied from one to the other. The one that displays the
products & inventories works - I get an Excel book I can read - the other
does not - it returns a 0 byte file that produces the "Unable to read
file" message when I try to open it. On each page, I am taking a web page with
a datagrid on it to an excel file.
There are some differences between the 2 pages.
One, the product page does not have sortable columns, while the customer
list did (I took this out of the customer list with no effect, so I put it
back in).
Two, the product listing page is loaded as the result of an If Not
page.ispostback condition in the Page_load event, and does not require any
clicks of boxes or buttons. The Customer listing allows you to make some
selections before the datagrid is loaded (such as by a distribution
channel), and the also allows you to filter the request (so you can pick
out just shipto locations, or soldto information only). Therefore, the
customer list datagrid is generated based on one of 2 things - whether a radio
button that indicates you want all distribution channels displayed, or whether
the index has changed on a combo box. That builds your sql based on your
selections you've made and once you've selected either the All button or
the appropriate combo box item, it'll run the sql and load your datagrid based
on those selections.
You'll then click a radio button to bring it to excel. Both pages
function similarly, except the one where the datagrid is loaded in page_load works,
and the other one returns a zero byte page.
Any ideas as to what's wrong with this puppy?
SC
