Error:

Problem:

By default “Spell check” button uses “AjaxSpellCheck” not “SpellCheck “

  <telerik:EditorTool Name="SpellCheck" Enabled="true" />

Solution:

Use AjaxSpellchek

   <telerik:EditorTool Name="AjaxSpellCheck" Enabled="true" />

Error Message:

Timeout expired.  The timeout period elapsed prior to completion of the operation or the server is not responding.

Reason:

Default execution timeout value in SQL Studio is 30 seconds

Solution:

Increase the execution & connection timeout value while opening new query window(File --> New --> Database Engine Query)