How to use session with eval

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hi ,
i'm trying to use session to transfer eval value , instead of using query string .
how can i transfer value of Eval and how to recive it in destination page ?
here my code in source and destination page .

ASP.NET

<asp:Repeater ID="Repeater1" runat="server" DataSourceID="SqlDataSource1">
               <ItemTemplate>
                   <li>
                       <a href='<%# "../mid_topics/mid_topics.aspx?MainID="+Eval("MainID")+"&MainTopic="+Eval("MainTopic") %>'>
                           <img src='<%# "../AppImages/Main/" + Eval("MainID")  + ".jpg" %>' style="width: 210px; height: 170px;" alt="" /></a>
                       <b>
                           <asp:Label ID="Label2" Text='<%# Eval("MainTopic") %>' runat="server" Visible="True"> </asp:Label>
                       </b>
                       <asp:Label ID="Label1" runat="server" Text= '<%# Eval("MainID") %>'  ></asp:Label>
                   </li>
               </ItemTemplate>
           </asp:Repeater>

//in destination page

ASP.NET

<asp:Repeater ID="Repeater1" runat="server" DataSourceID="SqlDataSource1">
              <HeaderTemplate>
                                 </HeaderTemplate>
              <ItemTemplate>
                  <li><a href="index.html">
                      <img src='<%# "../AppImages/Mid/"+ Request.QueryString["MainID"].ToString()+"/" + Eval("MidID")  + ".jpg" %>' width="96" height="96" alt="spa" title="spa" /></a>
                      <h2><a href="index.html">
                          <asp:Label ID="Label2" Text='<%# Eval("MidTopic") %>' runat="server"> </asp:Label>
                      </a></h2>
                  </li>
              </ItemTemplate>
             

          </asp:Repeater>

Posted 27-Jul-16 3:15am

alaa deego

Updated 27-Jul-16 20:53pm

v2

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ZurdoDev 27-Jul-16 9:32am

Somewhere you need to do Session["someKey"] = someValue;

Then you get it back by doing someVariable = Session["someKey"]

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Vincent Maverick Durano · Answer 1 · 2016-07-27T05:14:00

Solution 1

Git rid of the anchor tag and use a LinkButton instead. Or you may use ImageButton since you are displaying images. You may also need to bind your MainID and MainTopic fields in a HiddenField controls. For example:

HTML

<ItemTemplate>
        <li>
         <asp:ImageButton runat="server" ID="ImageButton1" ImageUrl='<%# "~/AppImages/Main/" + Eval("MainID")  + ".jpg" %> ‘ OnClick="ImageButton1_Click"
 />
      <asp:HiddenField ID="HiddenField1" runat="server" Value='<%# DataBinder.Eval(Container.DataItem, "MainID") %>' />
      <asp:HiddenField ID="HiddenField2" runat="server" Value='<%# DataBinder.Eval(Container.DataItem, "MainTopic") %>' />
        </li>
</ItemTemplate>

Then on your code behind file, you could set the value to a Session like:

C#

protected void ImageButton1_Click(object sender, ImageClickEventArgs e){
        ImageButton b = (ImageButton)sender;
        RepeaterItem item = (RepeaterItem)b.NamingContainer;
        //find the Hidden values
        HiddenField mainID = (HiddenField)item.FindControl("HiddenField1");
        HiddenField mainTopic = (HiddenField)item.FindControl("HiddenField2");
        Session["MainID"] = mainTopic.Value;

        //redirect to other page
        Response.Redirect("~/mid_topics/mid_topics.aspx");
}

On your destination page, you could try something like this:

HTML

<a href="index.html">
                      <img src='<%# "../AppImages/Mid/"+ Session["MainID"].ToString() +"/" + Eval("MidID")  + ".jpg" %>' width="96" height="96" alt="spa" title="spa" /></a>

PS: Beware that Sessions can be null, so you may want to check for nulls before binding your Repeater in the destination page.

HTH!

Posted 27-Jul-16 5:14am

Vincent Maverick Durano

Updated 28-Jul-16 1:25am

v4

Comments

alaa deego 28-Jul-16 3:00am

Vincent Maverick Durano
could you pealse look again in the code

Vincent Maverick Durano 28-Jul-16 7:26am

I've updated the solution. Please check. By the way, did you down voted my solution?

ZurdoDev 28-Jul-16 7:44am

The OP has this inside a repeater. It is highly unlikely, but possible, that they want to show the same exact image over and over for every single record. I seriously doubt this is what the OP needs.

Vincent Maverick Durano 28-Jul-16 8:00am

The sample solution provided is inside a Repeater. If you noticed it's inside an ItemTemplate.

The ImageButton will render rows of images based on the source. And since he wanted to use Session, the only way is to set it is at code behind, and have the redirect on the server-side too.

I'm guessing you're the one down voting the solution. jeez

ZurdoDev 28-Jul-16 8:15am

"If you noticed it's inside an ItemTemplate." - That is exactly my point. Because the code is inside the ItemTemplate, as I said, the code will "show the same exact image over and over for every single record." Do you think the OP wants the same exact image for every single record? And if OP did, why not hardcode it or include it in the sql instead of the Session?

"I'm guessing you're the one down voting the solution." - No, I didn't because this is what the OP asked for. My point is, I don't think the OP actually wants what they asked for.

And don't worry about people downvoting. It's the internet, it is going to happen.

Vincent Maverick Durano 28-Jul-16 8:24am

"That is exactly my point. Because the code is inside the ItemTemplate, as I said, the code will "show the same exact image over and over for every single record."

I don't think so. Based on his code:

ImageUrl='<%# “~/AppImages/Main/" + Eval("MainID") + ".jpg” %> ‘

The OP appended the MainID as the file name for the images, so it's not static and it's not the same exact images. At runtime it will generate rows of images like 1.jpg, 2.jpg N.jpg.

"My point is, I don't think the OP actually wants what they asked for." - I completely understand your point. I wouldn't give a solution in the first place if I knew the images are static.

"And don't worry about people downvoting. It's the internet, it is going to happen." - agreed. It's just very demotivating to get downvotes without any reasons at all. :(

ZurdoDev 28-Jul-16 8:29am

One of us is reading this all wrong. OP wrote "i'm trying to use session to transfer eval value , instead of using query string." The only thing OP had coming from QueryString on destination page was the MainID, so, no, it is not different for every record. It is the same.

Vincent Maverick Durano 28-Jul-16 8:38am

"The only thing OP had coming from QueryString on destination page was the MainID, so, no, it is not different for every record. It is the same." - if the Repeater won't generate rows then your assumption is correct. :)

For what I have understood, the origin page will show different images based on MainID:

MainID 1
MainID 2
MainID 3

clicking on MainID 2 will redirect to the destination page, and passing along the MainID 2 value then display the related information in the destination page. Think of it as Master-Detail navigation.

I wouldn't argue on you with this. Let's just wait for the OP's feedback.

ZurdoDev 28-Jul-16 8:43am

My apologies. It was me who was not looking closely enough. I did not notice this part of the url for the image: "+"/" + Eval("MidID") + ".jpg""

The MainID was used to select a folder and then MidID was used to show different images. Again, my apologies.

However, I still say using the Session for this is not the way to do it; however, it may be the best way for the user based on something we do not know.

Thanks for your patience. ;)

Vincent Maverick Durano 28-Jul-16 9:08am

" Again, my apologies." = no worries :)

"However, I still say using the Session for this is not the way to do it;" - I know, the OP just makes things complicated or perhaps the OP has reasons for forbidding querystrings (e.g avoid exposing the ID and to have a clean URL)

alaa deego 28-Jul-16 10:39am

Thanks alot :)

Vincent Maverick Durano 6-Sep-16 6:13am

is there any reason you unmarked the solution?