casting from DataRowView To string

hi,
i am working on a project(windows form) using c#,i have used a data source for my combobox by connecting it to a database.
And in my form,when i try to see the item selected from the combo box  thru msgbox,it is displayed as System.DataRowView.
and i tried to cast it thru Convert.ToString(),but not successful.
i even tried by creating object for DataRowView and added the items from combobox to this DataRowView object and thentried to convert into string by Convert.ToString(),but yet unsuccessful.
kindly help me!!!!!!!!!!