session对象写入读取实例.登录状态判断.

textbox控件和buttion控件.

using System;

using System.Configuration;

using System.Data;

using System.Linq;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.HtmlControls;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Xml.Linq;

public partial class _Default : System.Web.UI.Page 

{

    protected void Page_Load(object sender, EventArgs e)

    {

    }

    protected void Button2_Click(object sender, EventArgs e)

    {

        txtName.Text = "";

        txtpwd.Text = "";

    }

    protected void Button1_Click(object sender, EventArgs e)

    {

        if (txtName.Text.Trim().Equals("mr") && txtpwd.Text.Trim().Equals("mrsoft"))

        {

            Session["name"] = txtName.Text.Trim();

            Response.Redirect("admin.aspx");

        }

        else

        {

            ClientScript.RegisterStartupScript(this.GetType(),"","alert('用户名或密码错误');",true);

        }

    }

}

--------------------------------------------------------------------------------------------

using System;

using System.Collections;

using System.Configuration;

using System.Data;

using System.Linq;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.HtmlControls;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Xml.Linq;

public partial class admin : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

        if (Session["name"] == null)

        {

            Response.Redirect("Default.aspx");

        }

        else

        {

            Response.Write("管理员"+Session["name"]+"成功登录！");

        }

    }

}