Question: I have problem with dll file and have project which need this file System.Windows.Controls.dll for 

```
listBox1.ItemsSource

```

error fix , and add reference with this dll to fix error.
Where i can find this dll file?
Is there any download link ? Share please !
Thanks !

In "Add Reference" it doesn't exist !

Solution: <http://download.microsoft.com/download/7/7/6/776875B7-AD81-44D4-AA47-648D1BCB097E/silverlight_sdk.exe>

Answer: 
This should be in the PresentationFramework.dll but that control is in the System.Windows.Controls namespace.

<http://msdn.microsoft.com/en-us/library/system.windows.controls.listbox.aspx>

You can add it by going to your project, Right clicking on References > Add Reference > .Net Tab > And selecting this DLL
I was able to find the dll file by searching my computer for "System.Windows.Controls.dll". I found it under the following file location... "C:\Program Files (x86)\Microsoft SDKs\Silverlight\v3.0\Libraries\Client\System.Windows.Controls.dll"

Hope this helps!