China and Pakistan have decided to lift bilateral ties to all-weather strategic partnership of cooperation.It came during Chinese President Xi Jinping's first state-visit to the South Asian country since he took office in 2013.During President Xi's two-day visit, the two countries also launched a scheme called China-Pakistan Economic Corridor, which contains roads, railways and energy projects linking southwest Pakistan's deep-water Gwadar Port with Northwest China's Xinjiang.It's the biggest-ever overseas investment by China.So how will this project benefit both sides?What can the two countries do to ensure the project can be carried out as planned?