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                                S Michaud 06.25.2012

                                  • Hi,

                                    I have my grid in a panel like this:


                                     <dx:ASPxCallbackPanel ID="CallbackgvSAH" ClientInstanceName="CallbackgvSAH" OnCallback="CallbackgvSAH_callback" runat="server" Style="width: 825px;">
                                    <PanelCollection>
                                    <dx:PanelContent ID="PanelContent3" runat="server" SupportsDisabledAttribute="True">
                                    <dx:ASPxGridView ID="gvSAH" runat="server" ClientInstanceName="gvSAH" KeyFieldName="TCSAH01_ID" CssFilePath="~/App_Themes/Aqua/{0}/styles.css" CssPostfix="Aqua" AutoGenerateColumns="False"
                                    Width="100%">
                                    <Columns>

                                    .....

                                    each time I tried to expand I get this error.

                                    "response.redirect cannot be called in a page callback"


                                     Protected Sub CallbackgvSAH_callback(ByVal source As Object, ByVal e As DevExpress.Web.ASPxClasses.CallbackEventArgsBase)
                                     
                                                pars = e.Parameter.Split(";")
                                     
                                                Load_gvSAH(pars)
                                     
                                            End Sub

                                    Sub Load_gvSAH(Optional ByVal pParm As String() = Nothing)
                                     
                                                '---------------------------------------------
                                                Dim _SQL As StringBuilder = New StringBuilder("where Inv_Status_ID in (0,6) and Status_ID <> 12 ")
                                       ......

                                    gvSAH.DataSource = objSAH.DS(_SQL.ToString)
                                                gvSAH.SettingsBehavior.AllowFocusedRow = False
                                                gvSAH.DataBind()
                                                gvSAH.GroupBy(gvSAH.Columns("TCSTR01_Name"))
                                     
                                            End Sub

                                callback - redirection error.jpg
                                • Mike (DevExpress Support) 06.26.2012

                                  P.S. I see that you are using AutoFormat settings. We recommend that you store control markup and AutoFormat settings within corresponding files (instead of mixing them) by using skin files:

                                  - Remove AutoFormat settings via a control designer;
                                  - Deploy the required DevExpress theme via the ASPxThemeDeployer tool.
                                  Choose the “Only skin files” (checked) - Copy only AutoFormat skin files to a project App_Themes/<AutoFormat Name> folder. This option requires the ASPxThemes assembly.
                                  - Specify the theme for the entire web site via the standard ASP.NET mechanism:
                                  Theming a Web Page or a Web Site

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                                1 Solution

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                                Mike (DevExpress Support) 06.26.2012

                                Hello,

                                It is impossible to redirect a page while processing a callback. Use the specially introduced ASPxWebControl.RedirectOnCallback method to accomplish this task.
                                Please refer to the Q305145 - How to execute redirect during callback / ASPxWebControl.RedirectOnCallback report where we discussed this issue in greater detail.

                                • Nikolai (DevExpress Support) 07.05.2012

                                  [DX Support team: this comment was created by S Michaud]

                                  OK good idea but it is happening when we click on a Tab from ASPxPageControl.

                                  Im not able top track if it pass through Tabclick and ActiveTabChanging event but I think that happens only when my session has been terminated...

                                  Have you an idea how to fix it?

                                • Nikolai (DevExpress Support) 07.05.2012

                                  Hi,

                                  Thank you for your response. I am afraid your scenario is not quite clear to me. Would your please describe your scenario in greater details. Some screenshots would be helpful. If it is possible, provide us with a markup and a code behind of the problematic page. This will help us to find an appropriate solution.

                                • S Michaud 07.13.2012

                                  Another example... when users click on a tab it tells : "response.redirect cannot be called in a page callback"

                                  This is the control:

                                   <dx:ASPxPageControl ID="tabControl" runat="server" ActiveTabIndex="0" Height="650px" TabSpacing="3px" Width="100%" EnableCallBacks="True" TabIndex="1">
                                                          <TabPages>
                                                              <dx:TabPage TabStyle-Width="80px" Text="Suivi">
                                                                  <ContentCollection>
                                                                      <dx:ContentControl ID="ContentControl2" runat="server" SupportsDisabledAttribute="True">
                                                                          <iframe src='../gui_config/tools/TransfertSessionValue.aspx?<%="sid=" & Session("Store_ID") & "&eid=" & Session("EmplID") & "&gid=" & Session("GrpID") & "&uid=" & Session("UserID") & "&sah_id=" & Request.QueryString("sah_id") & "&cid=" & Request.QueryString("cid")%>&path=~\\sah\\sah_form.aspx'
                                                                              scrolling='yes' marginwidth='0' marginheight='0' frameborder='0' vspace='0' hspace='0' width='100%' height='880'></iframe>
                                                                      </dx:ContentControl>
                                                                  </ContentCollection>
                                                              </dx:TabPage>
                                                              <dx:TabPage TabStyle-Width="80px" Text="Calendrier">
                                                                  <ContentCollection>
                                                                      <dx:ContentControl ID="ContentControl3" runat="server" SupportsDisabledAttribute="True">
                                                                          <iframe src='../gui_config/tools/TransfertSessionValue.aspx?<%="sid=" & Session("Store_ID") & "&eid=" & Session("EmplID") & "&gid=" & Session("GrpID") & "&uid=" & Session("UserID") %>&path=~\\sah\\sah_schedule.aspx'
                                                                              scrolling='no' marginwidth='0' marginheight='0' frameborder='0' vspace='0' hspace='0' width='100%' height='980'></iframe>
                                                                      </dx:ContentControl>
                                                                  </ContentCollection>
                                                              </dx:TabPage>
                                                              <dx:TabPage TabStyle-Width="80px" Text="Follow up" Visible="false">
                                                                  <ContentCollection>
                                                                      <dx:ContentControl ID="ContentControl4" runat="server" SupportsDisabledAttribute="True">
                                                                          <iframe src='../gui_config/tools/TransfertSessionValue.aspx?path=~\sah\sah_followup.aspx' scrolling='yes' marginwidth='0' marginheight='0' frameborder='0' vspace='0' hspace='0' width='100%'
                                                                              height='680'></iframe>
                                                                      </dx:ContentControl>
                                                                  </ContentCollection>
                                                              </dx:TabPage>
                                                          </TabPages>
                                                          <Paddings Padding="2px" PaddingLeft="5px" PaddingRight="5px" />
                                                          <ContentStyle>
                                                              <Border BorderColor="#AECAF0" BorderStyle="Solid" BorderWidth="1px" />
                                                          </ContentStyle>
                                                      </dx:ASPxPageControl>

                                • Sergey A (DevExpress) 07.16.2012

                                  Hi,

                                  Please, provide us with a sample project. We can't figure out the problem having only the aspx markup.

                                  Thanks!

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