简单的asp.net模拟邮箱系统基础实现（二 （2）具体版块功能的实现及关键代码之登陆页面）

登陆界面：

 

前台代码比较简单就不贴了

 

c#

 

要要引入

using System.Data.SqlClient;

using System.Data;

 

namespace email

{

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

    {

        protected void Page_Load(object sender,EventArgs e)

        {

 

        }

//登陆  获取控件中的值 去数据库查询是否存在来完成用户名和密码的验证

        protected void login_Click(object sender,EventArgs e)

        {

            int t;

            String str =
@"Data Source = (LocalDB)\MSSQLLocalDB; AttachDbFilename = C:\Users\asus\Documents\Visual Studio 2015\Projects\email\email\App_Data\DB.mdf; Integrated Security = True";

            SqlConnection con =
new SqlConnection(str);

            try

            {

                con.Open();

                SqlCommand cmd =
new SqlCommand("select count(*) from userinfor  where USERID=@user and PASS=@pass", con);

                cmd.Parameters.Add("@user",SqlDbType.NVarChar);

                cmd.Parameters.Add("@pass",SqlDbType.NVarChar);

                cmd.Parameters[0].Value = username.Text;

                cmd.Parameters[1].Value = password.Text;

 

                t = (int)cmd.ExecuteScalar();

                if (t > 0)

                {

                    Session["userid"] = username.Text;

                    Response.Redirect("~/SendPage.aspx");

                }

                else

                {

                    inf.Text = "用户名或密码错误";

                }

 

            }

            catch

            {

                login.Text = "连接失败";
            }

            finally

            {

                con.Close();

            }

        }

    }

}