Type 'ADOConnection' is not defined

<%@Import Namespace=System.Data.OleDb%> <%@Import Namespace=System.Data%> <%@Import Namespace=System.Data.SqlClient%> BC30002: Type 'ADOConnection' is not defined. Source Error: Line 19: Line 20: sub b1_click(sender as object,e as eventargs) Line 21: dim cna as ADOConnection=new ADOConnection Line 22: dim cma as adocommand=new adocommand Line 23: cna.provider="microsof oledb 4" ---------------------------------------------------- who can help me ?? why still error