Я хотел добавить последнее состояние web.config:
<system.web>
<pages controlRenderingCompatibilityVersion="3.5" theme="OrderDefault" clientIDMode="AutoID">
<controls>
<add namespace="System.Web.UI.DataVisualization.Charting" assembly="System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" tagPrefix="asp" />
<add namespace="DevExpress.Web.ASPxPivotGrid" assembly="DevExpress.Web.ASPxPivotGrid.v10.2, Version=10.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" tagPrefix="dx"/>
<add namespace="DevExpress.Xpo" assembly="DevExpress.Xpo.v10.2.Web, Version=10.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" tagPrefix="dx" />
<add namespace="DevExpress.Data.Linq" assembly="DevExpress.Web.v10.2.Linq, Version=10.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" tagPrefix="dx" />
<add namespace="DevExpress.Web.ASPxGridView.Export" assembly="DevExpress.Web.ASPxGridView.v10.2.Export, Version=10.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" tagPrefix="dx" />
<add namespace="DevExpress.Web.ASPxEditors" assembly="DevExpress.Web.ASPxEditors.v10.2, Version=10.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" tagPrefix="dx" />
<add namespace="DevExpress.Web.ASPxGridView" assembly="DevExpress.Web.ASPxGridView.v10.2, Version=10.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" tagPrefix="dx"/>
<add namespace="DevExpress.Web.ASPxPopupControl" assembly="DevExpress.Web.v10.2, Version=10.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" tagPrefix="dx" />
<add namespace="DevExpress.Web.ASPxSiteMapControl" assembly="DevExpress.Web.v10.2, Version=10.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" tagPrefix="dx"/>
<add namespace="System.Web.UI.WebControls" assembly="System.Web.Entity, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" tagPrefix="asp" />
<add namespace="System.Web.UI.DataVisualization.Charting" assembly="System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" tagPrefix="asp" />
<add namespace="DevExpress.Web.ASPxNewsControl" assembly="DevExpress.Web.v10.2, Version=10.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" tagPrefix="dx" />
<add namespace="DevExpress.Web.ASPxPanel" assembly="DevExpress.Web.v10.2, Version=10.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" tagPrefix="dx" />
</controls>
</pages>
</system.web>
![alt text](https://i.stack.imgur.com/jG89K.png)