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+# Webform
+
+### Asp.NET
+
+#### B/S?C/S?
+
+C/S指客户端软件
+
+B/S指浏览器
+
+## IIS
+
+是Windows severs 操作系统免费捆绑的组件
+
+是web应用程序运行的服务器
+
+# 页面对象
+
+### IsPostBack属性
+
+判断是否回发或首次加载
+
+true =回发   false=首次加载
+
+```C#
+protected void Page_Load (object sender,EventArgs e)
+{
+    if(!Page.IsPostBack)
+    {
+    	this.对象.Text = System.DateTime.Now.ToString();    
+    }
+}
+```
+
+### 页面传值
+
+```C#
+      protected void Page_Load(object sender, EventArgs e)
+        {
+            //设置初始值
+            //1.首次加载
+            if (!IsPostBack)
+            {//            key      value
+                ViewState["c"] = 0;
+            }
+        }
+        //没有成员变量
+        //无状态:
+        
+        protected void Button1_Click(object sender, EventArgs e)
+        {
+            
+            int counter = (int)ViewState["c"];
+            counter++;
+            lit.Text = counter.ToString();
+            ViewState["c"] = counter;
+        }
+```
+