An explicit calculation of Casimir effect through an alternative approach of
field quantization [1, 2], has been presented in this paper. In this method,
the auxiliary negative norm states have been utilized, the modes of which do
not interact with the physical states or real physical world. Naturally these
modes cannot be affected by the physical boundary conditions. Presence of
negative norm states play the rule of an automatic renormalization device for
the theory.Comment: 7 pages, LaTe