使用oleDb来使用数据库连接

       using System.Data.OleDb;
       public DataView GetSata(string sqlcmd)
        {
            System.Data.Odbc.OdbcConnection conn = new System.Data.Odbc.OdbcConnection();
            try
            {
                conn.ConnectionString = "FIL=MS Access;DSN=ProjectManage";
                conn.Open();
                System.Data.Odbc.OdbcDataAdapter da = new System.Data.Odbc.OdbcDataAdapter(sqlcmd, conn);
                DataTable dt = new DataTable();
                da.Fill(dt);
                return dt.DefaultView;
            }
            catch (Exception ex)
            {
                // MessageBox.Show(ex.Message);
                return null;
            }
            finally
            {
                conn.Close();
            }

        }