Steady flow of a Casson fluid in the presence of a nanoparticle is studied. It is considered that the sheet is stretched in both the direction along the xy-plane. Moreover, we have considered the magnetohydrodynamics effect within the fluid and convective condition along the surface. Similarity transformation is used to convert the governing partial differential equations to a set of coupled nonlinear ordinary differential equations which are solved numerically. The behavior of emerging parameters are presented graphically and discussed for velocity, temperature, and nanoparticles fraction. Variation of the reduced Nusselt and Sherwood number against physical parameters are presented graphically. It is found that the reduced Nusselt number is the decreasing function and the reduced Sherwood number is the increasing function of Brownian parameter Nb and thermophoresis parameter Nt.