Could not refresh controls (Error 40504)

The Refresh method of the RemoteData control failed because of one of the following reasons:

• A connection could not be established.
  
  
• A result set could not be opened.
  
  
• A bound control failed to update.

Check the connection, the result set, and the control bindings (review information in the bound control documentation). This error can also occur if the server or network unexpectedly drops the connection. Generally, it indicates that the rdoResultset or connection is no longer usable.