By default, the ASPxCardView works during callbacks and there's no way to update an external control (that isn't a child control of the callback owner) on the server side. The following article describes this limitation in detail.
The Concept of Callbacks
This example covers both the JSProperties feature of the ASPxCardView that allows passing a value from the server to the client and the client-side EndCallback event, which is raised each time a callback is executed successfully.
It is possible to set a JSProperty on the server, get it on the EndCallback, and change the "target" control using its client-side capabilities.
This example illustrates how to use the ASPxLabel to identify that the grid was successfully updated.
The Concept of Callbacks
This example covers both the JSProperties feature of the ASPxCardView that allows passing a value from the server to the client and the client-side EndCallback event, which is raised each time a callback is executed successfully.
It is possible to set a JSProperty on the server, get it on the EndCallback, and change the "target" control using its client-side capabilities.
This example illustrates how to use the ASPxLabel to identify that the grid was successfully updated.