web对象的使用

简易聊天室：

protectedvoidPage_Load(objectsender,EventArgse)

{

Labelsay=newLabel();

say.Text=Application["content"].ToString();

this.Panel1.Controls.Add(say);

}

protectedvoidButton1_Click(objectsender,EventArgse)

{

stringa=null;

a=Request["names"];

Application["content"]=Application["content"]+a+"\n"+"说:"+"<imgsrc='image/"+DropDownList1.SelectedValue+".gif'>"+this.TextBox1.Text+"<br/>";

}

站点计数器：

protectedvoidPage_Load(objectsender,EventArgse)

{

intnums=(int)Application["nums"];

nums++;

Application.Lock();

Application["nums"]=nums;

intsum=0;

Labella=newLabel();

do

{

sum=nums%10;

Application["content"]="<imgsrc='image/"+sum.ToString()+".png'/>";

nums=nums/10;

la.Text=Application["content"].ToStrin

g()+la.Text;

}while(nums!=0);//显示数字图片

this.Panel1.Controls.Add(la);

Application.UnLock();

}

Session对象和Cookies对象

if(this.TextBox1.Text.Trim()!="张三"|this.TextBox2.Text!="asdf")

{

Response.Write("输入有误！");

}

else

{

HttpCookiecookie=newHttpCookie("username",this.TextBox1.Text);

//利用Cookie实现自动欢迎信息（一次登陆之后，以后每次登陆自动获取原来的登陆信//息）

cookie.Expires=DateTime.Now.AddHours(1);

this.Response.Cookies.Add(cookie);

Session["username"]=this.TextBox1.Text;

Response.Redirect("Default2.aspx");

}

//实现网络安全性

if(Session["username"]==null)

this.Response.Redirect("default.aspx",true);

this.Literal1.Text=this.Session["username"].ToString();

this.Literal1.Text="欢迎你"+Session["username"];//通过Session对象传递信息