S. 250: Appeal-Commissioner (Appeals)]-Procedure]-Duty Commissioner (Appeals) cannot dismiss appeal on account of non-prosecution of appeal by assessee Duty-bound to dispose of the appeal through a speaking order on merits, on all the points which arose for determination in the appellate proceedings, including on all the grounds of appeal-Order of the CIT(A) is set aside and he is directed to pass de novo order as per law, in accordance with law. [250(6), 251 (2)]