optimise files

CS/16_3/Program.cs

@@ -0,0 +1,26 @@
+using System;
+using System.IO;
+
+namespace _16_3
+{
+    class Program
+    {
+        private const string FILE_NAME = @"c:\temp\TestFile.txt";
+        static void Main(string[] args)
+        {
+            using (StreamWriter sw = new StreamWriter(FILE_NAME))
+            {
+                sw.Write("文本文件");
+                sw.Write("的写入/读取");
+                sw.WriteLine("-----------------------");
+                sw.WriteLine("写入整数{0}，或浮点数{1}", 1, 4.2);
+                bool b = false; char grade ='A'; string s = "Multiple Data Type!";
+                sw.WriteLine("写入布尔值、字符、字符串、日期：");
+                sw.WriteLine(b);
+                sw.WriteLine(grade);
+                sw.WriteLine(s);
+                sw.Write("当前日期：");sw.WriteLine(DateTime.Now);
+            }
+        }
+    }
+}