Add data to access table in vb.net -

i have created form in visual studio 2010 & following code using

private sub button1_click(byval sender system.object, byval e system.eventargs) handles button1.click         dim dbprovider = "provider=microsoft.ace.oledb.12.0;"         dim dbsource = "data source=|datadirectory|\membership.accdb"         dim con new oledb.oledbconnection         con.connectionstring = dbprovider & dbsource         con.open()          dim sql = "insert memberdetail (membername, memberadd, membercontact, memberphone1, memberphone2, membersince) values (?, ?, ?, ?, ?, ?)"         using cmd = new oledb.oledbcommand(sql, con)              cmd.parameters.addwithvalue("@p1", me.memname.text)             cmd.parameters.addwithvalue("@p2", me.memadd.text)             cmd.parameters.addwithvalue("@p3", me.memcontact.text)             cmd.parameters.addwithvalue("@p4", me.memphone1.text)             cmd.parameters.addwithvalue("@p5", me.memphone2.text)             cmd.parameters.addwithvalue("@p6", me.datetimepicker1.text)             cmd.executenonquery()         end using         me.close()     end sub 

but edits available data in table everytime , not add new row table when enter new data.

where wrong.

please help.