How to have specific error message on SQL Insert Statement with Parameters using vb.net? -


basically, have sql insert statement paramaters: 

sqlquery = "insert tbl_visitor_info(lname, fname) values(?, ?)"     dim cmd new oledbcommand     dim con new oledbconnection(access_connection)     try         con.open()         cmd             .connection = con             .commandtype = commandtype.text             .commandtext = sqlquery              .parameters.add("@lname", oledbtype.varchar).value = lname             .parameters.add("@fname", oledbtype.varchar).value = fname             .executenonquery()         end     catch ex exception         msgbox(ex.message)     end try     con.close()

now, example, invalid data entered either 1 of parameters
possible prompt parameter causes error?
try catch returns "there error in insert statement"
using ms access 2010 database.

try replacing question marks in query parameter names:

sqlquery = "insert tbl_visitor_info(lname, fname) values(@lname, @fname)"

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