Assign variable in Listview from code behind

vykintas · April 26th, 2013, 08:56 AM

Hi,

I'm developing user page where he can view his uploaded files. I'm using LINQ and ADO.NET entity framework.

In the aspx page I have Listview control and Entity data source. My ListView looks like:

HTML Code:

 <asp:ListView ID="ListView1" runat="server" DataKeyNames="Id" DataSourceID="EntityDataSource1" ItemType="MyWebsiteModel.Image">
        <ItemTemplate>
          <li>
            Upload date:
            <asp:Label ID="CreateDateTimeLabel" runat="server" Text='<%# Item.CreateDateTime %>' />
            <br />
            Category:
            <asp:Label ID="CategoryLabel" runat="server" Text='<%# CategoryName %>' />
            <br />
            <asp:Button ID="DeleteButton" runat="server" CommandName="Delete" Text="Delete" />
          </li>
        </ItemTemplate>
      </asp:ListView>

For example in code behind I'm having a code:

Code:

using (MyWebsiteEntities1 Entities = new MyWebsiteEntities1())
      {
        MyWebsiteModel.Image myImage = (MyWebsiteModel.Image)e.Entity;

        var Name = from category in Entities.Categories
                 where category.Id == myImage.CategoryId
                 select category.Name;
        string CategoryName = Name.Single();
      }

So as you see in code behind I have variable CategoryName. How can I show the value of this variable on this label:

<asp:Label ID="CategoryLabel" runat="server" Text='<%# CategoryName %>' />

mmorgan30 · April 26th, 2014, 11:57 AM

first you need to fix your binding expressions

Code:

 
<asp:ListView ID="ListView1" runat="server" DataKeyNames="Id" DataSourceID="EntityDataSource1" ItemType="MyWebsiteModel.Image">
   <ItemTemplate>
      <li>
         Upload date:
         <asp:Label ID="CreateDateTimeLabel" runat="server" Text='<%# Eval("CreateDateTime") %>' />
         <br />
         Category:
         <asp:Label ID="CategoryLabel" runat="server" Text='<%# Eval("CategoryName") %>' />
         <br />
         <asp:Button ID="DeleteButton" runat="server" CommandName="Delete" Text="Delete" />
      </li>
   </ItemTemplate>
</asp:ListView>

now what is your behind code, where is it located... in page_load... where exactly? what was its intended purpose? Not sure what it is for since you have a data source attahced to the listview. data sources takes care of the handling most operation if configured correctly.