使用C＃的ASP.NET

Question

I have one page which is placed in the Master Page.

In the master page i have 1 dropdown and one GridView, dropdown is display the category , based on the dropdown list selection it will display the list of videos in the Grid.

In the content page i have the video player, in the page load it will play the video by default.

But when i choose the drop down list which is available in the master page, the page is refreshing, SO the video is start play from the first.

The content page should not refresh, So the video will continuously play.

So please advice how to stop the page refresh in the content page. please help me its urgent.

Thanks in Advance

All are in mater page

`

                    <asp:DropDownList ID="drp_Channel" Width="220px" CssClass="ddl" 
                            AutoPostBack="true" runat="server" 
                            onselectedindexchanged="drp_Channel_SelectedIndexChanged">
                      <asp:ListItem>-- Select Channels --</asp:ListItem>
                      </asp:DropDownList>
                   </ContentTemplate>
                    </asp:UpdatePanel>

                            <asp:GridView ID="grd_Video" runat="server" AutoGenerateColumns="False" OnRowCommand="LinkName"
                            GridLines="None" ShowHeader="False" Width="100%" EmptyDataText="No Videos Found" >
                            <Columns>
                                <asp:TemplateField>
                                    <ItemTemplate>

                                        <asp:ImageButton ID="img_Video" runat="server" BorderColor="#666699" CssClass="imgbox"
                                            ImageUrl='<%#(string)FormatImageUrl((string)Eval("Video_Thumbnail")) %>' 
                                            CommandName="imgClick" CommandArgument='<%# Bind("Video_ID")%>' 
                                            BorderWidth="0px" Height="40px" ToolTip="Click to view video" Width="50px" 
                                            BorderStyle="Double" />

                                    </ItemTemplate>
                                </asp:TemplateField>
                                <asp:TemplateField>
                                    <ItemTemplate>
                                    <asp:LinkButton ID="lnk_VideoName" runat="server" ToolTip="Click to view video" 
                                            CommandName="lnkClick" CommandArgument='<%# Bind("Video_ID")%>' 
                                            Text='<%# DataBinder.Eval(Container, "DataItem.Video_Name") %>' 
                                            CssClass="linkVideo" Width="130px"></asp:LinkButton> 

                                    </ItemTemplate>
                                </asp:TemplateField>
                            </Columns>
                            <AlternatingRowStyle BackColor="#cccccc" />

                        </asp:GridView>
                        </ContentTemplate>
                            </asp:UpdatePanel>`

in code behind for binding grid,

DataTable dt1Video = new MDBusiness.MDSUser().GetVideo(intNetId, intChanId, intCatId); grd_Video.DataSource = dt1Video; grd_Video.DataBind(); up1.Update(); up2.Update();

Answer 1

Set AutoPostBack = "False" on your dropdownlist to stop the postback from occurring. Users will then be able to change the dropdownlist without anything happening.

You'll need to use AJAX with your dropdownlist if you want to be able to use it without the postback.

Answer 2

for a quick answer

• Install ASP.NET AJAX library
• Wrap the GridView in a UpdatePanel
• Set the trigger to be the DropDownList

Done :)

Remember to see this Screencast ... it is exactly what you are after!