The Entity Data Source appears on the Toolbox, in the Data section.
Here's some helpful information from an MSDN blog for people who can't see the item in the Toolbox:
Can't find the Entity Data Source?
If you upgrade the RTM version of Visual Studio 2008 with SP1, the EntityDataSource control doesn't appear in the Data group of the Web project Toolbox by default. To add the control to the Toolbox:
- ·Open Visual Studio
- ·Open or create a Web Application
or Project.
- ·Make sure the Toolbox tool window is visible.
- ·Right click on the Toolbox, in the Data group and click on the "Choose Items…" option.
- ·Wait for the "Choose Toolbox
Items" window to appear.
- ·Scroll down in the list of components under the ".NET Framework
Components" tab until you find
"EntityDataSource"
- ·Ensure the checkbox is marked
next to the EntityDataSource
component and click on the OK
button.
If you cannot see “EntityDataSource” in the list, you may need to add the assembly manually. To do that, click on the “Browse” button on the “Choose Toolbox Items” window. Then browse for the System.Web.Entity.dll under “C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.5” or the equivalent folder in your configuration.