private void btnok_Click(object sender, EventArgs e)
        {
            try
            {
                    OleDbConnection ConDBOleDB = new System.Data.OleDb.OleDbConnection(
                            "Provider=Microsoft.Jet.OLEDB.4.0;Password=;"
                            + "User ID=Admin;Data Source=G://patientenverwalung//arztpraxis.mdb");

                 OleDbCommand cmd = new OleDbCommand("INSERT INTO patient (name , vorname, datum , strasse , wohnort, plz) VALUES ( 'test' , 'test' , '28.03.1987' , 'test' , 'test' , 'zahl')", ConDBOleDB);

                ConDBOleDB.Open();
                cmd.ExecuteNonQuery();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally 
            {
                ConDBOleDB.Close();
            }

        }