Код: Выделить всё
con = new OleDbConnection(@"Provider=Microsoft.JET.OLEDB.4.0;Data Source=|DataDirectory|\database.mdb");
com = new OleDbCommand("Select * from testing", con);
con.Open();
OleDbDataReader reader;
reader = com.ExecuteReader();
GridView1.DataMember = "testing";
GridView1.DataSource = reader;
GridView1.DataBind();
reader.Close();
con.Close();
Подробнее здесь: https://stackoverflow.com/questions/333 ... f-gridview