i got a combo box and datagridview in my form and few other controls (to insert new record into my database),after the insertion is succcesful i want the inserted item to be displayed in my combo box and gridview by then only (i.e without restarting the project) could u please help me out..

You could use a BindingSource with the DataGridView. Then when your records are inserted successfully call the ResetBindings() Method. Click Here

Add the item to the Combox Items List.