title: The type or namespace name 'ToolkitScriptManager' does not exist in the namespace 'System.Web.UI.WebControls'
body: <p>i'am trying to use ajaxcontroltoolkit in my asp.net web forms project. I have added the reference already and also added the kit to the toobox by using its dll that i got from NuGet. But when i try to run project i get this error. By the way i'am using visual studio 2012 ultimate.</p>
  
  <p>Unknown Server Control Error</p>
  
  <p>Here is my codes</p>
  
  <pre><code>                &lt;asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server"&gt;&lt;/asp:ToolkitScriptManager&gt;
                  &lt;asp:TabContainer ID="TabContainer1" runat="server"&gt;
                      &lt;asp:TabPanel&gt;
                          &lt;HeaderTemplate&gt;Add Category&lt;/HeaderTemplate&gt;
                          &lt;ContentTemplate&gt;&lt;/ContentTemplate&gt;
                      &lt;/asp:TabPanel&gt;
                      &lt;asp:TabPanel&gt;
                          &lt;HeaderTemplate&gt;Add Brand&lt;/HeaderTemplate&gt;
                          &lt;ContentTemplate&gt;&lt;/ContentTemplate&gt;
                      &lt;/asp:TabPanel&gt;
                      &lt;asp:TabPanel&gt;
                          &lt;HeaderTemplate&gt;Add Model&lt;/HeaderTemplate&gt;
                          &lt;ContentTemplate&gt;&lt;/ContentTemplate&gt;
                      &lt;/asp:TabPanel&gt;
                      &lt;asp:TabPanel&gt;
                          &lt;HeaderTemplate&gt;Add Shoe&lt;/HeaderTemplate&gt;
                          &lt;ContentTemplate&gt;&lt;/ContentTemplate&gt;
                      &lt;/asp:TabPanel&gt;
                  &lt;/asp:TabContainer&gt;
  </code></pre>
  
  <p>I have google it already but i couldn't find any solution. I can add any neccesary information if you need. Thanks for any help.</p>