(AGI) Milan, Sept 26 - The Milan Stock Exchange closed higher,mainly thanks to rising banking shares. The FTSE MIB closed1.88 percent higher at 20,795 points, and the All Share rose1.66 percent. Piazza Affari posted the best performance of allEuropean stock markets, boosted by the positive result of agovernment bond auction on Friday morning. Shares kept risingin the afternoon after the release of figures on the U.S.economy. . .