实现记住密码,有效期等功能.cookie.

cookie对象的expires属性和value属性.

下面是两部分实例:

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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["username"] == null)

{

Response.Redirect("Default.aspx");

}

else

{

Response.Write("用户" + Session["username"] + "成功登录！");

}

}

}

///////////////////////////////////////////////////////////////////////////

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["username"] = txtname.Text.Trim();

if (ckbauto.Checked)

{

if (Request.Cookies["username"] == null)

{

Response.Cookies["username"].Expires = DateTime.Now.AddDays(30);

Response.Cookies["userpwd"].Expires = DateTime.Now.AddDays(30);

Response.Cookies["username"].Value = txtname.Text.Trim();

Response.Cookies["userpwd"].Value = txtpwd.Text.Trim();

}

}

Response.Redirect("admin.aspx");

}

else

{

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

}

}

protected void txtname_TextChanged(object sender, EventArgs e)

{

if (Request.Cookies["username"] != null)

{

if (Request.Cookies["username"].Value.Equals(txtname.Text.Trim()))

{

txtpwd.Attributes["value"] = Request.Cookies["userpwd"].Value;

}

}

}

}