How to create parameterized queries in vb.net?

You'll need to use the OleDbConnection class, as well as the OleDbCommand class, with the proper connection string for Access.

Dim sql as String = "SELECT * FROM TABLE_A WHERE COLUMN_A = @PARAM"
Dim connectionString as String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\mydatabase.mdb;User Id=admin;Password=;"
Using connection As New OleDbConnection(connectionString)
   Dim command As New OleDbCommand(sql)
   command.Connection = connection
   command.Params.Add("@PARAM", yourVariable)
   connection.Open()
    Dim reader As OleDbDataReader = command.ExecuteReader()
    While reader.Read()
        Console.WriteLine(reader.GetString(1)
    End While
End Using

You may find this helpful: http://stackoverflow.com/questions/251276/howto-parameters-and-like-statement-sql