/// <summary>
		/// 按名字清除本应用数据库 * * 
		/// </summary>
		/// <param name="context">Context.</param>
		/// <param name="dbName">Db name.</param>
		public static void cleanDatabaseByName(Context context, String dbName) {  
			
			context.DeleteDatabase(dbName);  
		}  
 public static void deleteDatabase(Context context)
 {
     context.DeleteDatabase(DATABASE_NAME);
 }