Hi Murat,
Thanks for using Syncfusion products and sorry for the
delay in getting back to you.
Could you please refer the below link to create the
diagram in Asp.Net MVC 3 and Asp.Net MVC 4
application?.
http://help.syncfusion.com/ug/asp.net%20mvc/diagram/documents/creatingadiagramcont.htm
Please let us know if any concerns.
Regards,
Senthilkumar M