... base, 44 , 43 1 43 4, 595 contract implementation and, 157–159 derived, 44 , 145 – 149 generic, 311–3 14 leaf, 70, 43 1 nested, 71– 74 new keyword for, 103–1 04 non-nested, 71 partial, 76–77 sealed, 69, 145 , ... arrays, 243 –255 covariance and, 247 – 248 declaring, 243 – 244 implicit typed, 244 – 246 jagged, 253–255 multidimensional, 251–255 param, 123 rectangular, 251–253 searchability, 248 sortability and, 248 ... 76–77 sealed, 69, 145 , 43 0 43 1 sealing, 49 5 static, 79–80 Clone method, 45 , 215, 43 5, 43 8 44 0 Close method, 144 , 209 closed types See nongeneric types closures, 295–297, 509, 5 24, 533–538 in C# 1.0,...