thanks alot Sureshsekaran
i do this :
Register Tag:
<%@ Register Assembly="Syncfusion.Tools.Web" Namespace="Syncfusion.Web.UI.WebControls.Tools" TagPrefix="cc1" %>
Web.Config:
...
...
Note: Uninstall the Syncfusion assemblies in GAC in this case.
but i still have problem
when i add assemblies in web.config file , 2 lines adding automatically in references in Properties Page and this two reference name has type GAC instead of BIN , before i removed assemblies from GAC by Assembly Manager Utility
thx