Datatype mismatch errors in Access parameterized Date query in c#

con.Open();
          OleDbDataAdapter a = new OleDbDataAdapter("select * from data where date_of_complaint=" + dateTimePicker3.Value.Date + ";", con);
          DataTable t = new DataTable();
          a.Fill(t);
          dataGridView1.DataSource = t;
          con.Close();