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diff --git "a/\345\210\230\346\266\233/2023-05-22\347\254\254\344\270\200\346\254\241\350\257\276.md" "b/\345\210\230\346\266\233/2023-05-22\347\254\254\344\270\200\346\254\241\350\257\276.md"
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+~~~ C#
+//题目一
+var lst = new List<int>(){1,2,3,4,5,6,7,8,9,0}; 
+//筛选偶数，并从小到大排序
+//方法一
+var res = from n in lst where n>3 && n%2==0 orderby n select n;
+foreach (var item in res){
+    Console.Write($"{item} ");
+}
+
+//方法二
+var res1=lst.Where(n=> n>3 && n%2==0).OrderBy(n=>n).Select(n=>n);
+
+foreach (var item in res1)
+{
+    Console.Write($"{item} ");
+}
+
+//方法三
+var arr= new List<int>();
+ foreach (var item in lst)
+{
+    if  (item>3 && item%2==0)
+         {
+             arr.Add(item);
+         }
+ }
+
+ arr.Sort();
+ foreach (var item in arr)
+ {
+     Console.Write($"{item}  ");
+ }
+
+
+//题目二
+//统计随机数出现的次数。
+var rnd = new Random(1000);
+var arr = Enumerable.Range(0,100).Select(_ => rnd.Next(0,10));
+//答案
+foreach (var v in arr.GroupBy(x => x).Select(x => new { k = x.Key, c = x.Count() }))
+                Console.WriteLine("{0}出现了{1}次", v.k, v.c);
+            Console.ReadLine();
+~~~
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