how to create an object for a class and name spaces for database access ?

for "ms acces database" access, first you need to include following namespaces in your project.

using System.Data; // in form application it is already included
using System.Data.OleDb;

Now here goes the code:

OleDbConnection con = new OleDbConnection("here your database connection string (including @ before string)");

string query="here your query";

OleDbDataAdapter da=new OleDbDataAdapter(query,con);
DataTable dt=new DataTable();
da.Fill(dt);

//now your record has been fetched.