Question

我已在Visual Studio中创建了具有SQL数据库连接的在线购物网站，并使用链接按钮将登录页面和注册页面连接到了索引页面。如果用户已登录，请显示用户名并显示注销按钮。如果用户未登录，请显示注册按钮。

但是在我用密码创建了1个用户然后进入登录页面后，它起作用了，但是在用密码创建了第二个用户之后，登录页面始终显示错误的密码，而信息却是正确的，因为我已经在SQL数据库中签入了第二个用户已注册，但仍未登录登录页面。这些是我的登录和注册代码：

这是我的登录代码

    protected void btnlogin_Click(object sender, EventArgs e)
    {

        SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["connect"].ToString());
        con.Open();
        string query = "select * from TableUser where Username=@username AND Password=@password ";
        SqlCommand cmd = new SqlCommand(query, con);
        cmd.Parameters.AddWithValue("@username", txtusername.Text.Trim());
        cmd.Parameters.AddWithValue("@password", txtpassword.Text.Trim());

        int count = Convert.ToInt32(cmd.ExecuteScalar());
        if (count == 1)
        {

            Session["username"] = txtusername.Text;
            Response.Redirect("index.aspx");
        }
        else
        {
            Response.Write("Your Password and Username are Incorrect !!");
        }

    }

这是我的注册代码：

    protected void btnsignup_Click(object sender, EventArgs e)
    {
        SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["connect"].ToString());
        con.Open();
        string query = "insert into TableUser ([Username], [Password],[Email],[Address],[Phone]) values(@username,@password,@email,@address,@phone)";
        SqlCommand cmd = new SqlCommand(query, con);
        cmd.Parameters.AddWithValue("@username", txtusername.Text.Trim());
        cmd.Parameters.AddWithValue("@password", txtpassword.Text.Trim());
        cmd.Parameters.AddWithValue("@email", txtemail.Text);
        cmd.Parameters.AddWithValue("@address", txtaddress.Text);
        cmd.Parameters.AddWithValue("@phone", txtphone.Text);
        cmd.ExecuteNonQuery();

        txtusername.Text = "";
        txtpassword.Text = "";
        txtemail.Text = "";
        txtaddress.Text = "";
        txtphone.Text = "";

        Session["username"] = txtusername.Text;
        Response.Redirect("Login.aspx");
    }

这是我的母版页代码：

    protected void Page_Load(object sender, EventArgs e)
    {
        if (Session["username"] != null)
        {

            Label1.Text = "Welcome" + Session["username"].ToString();
            LinkButton1.Visible = true;

            LinkButton2.Visible = false;
        }

        else
        {
            LinkButton1.Visible = false;
            LinkButton2.Visible = true;
        }

    }

    protected void LinkButton1_Click(object sender, EventArgs e)
    {
        Session.Abandon();
        Session.Clear();
        Response.Redirect("Login.aspx");
    }

    protected void LinkButton2_Click(object sender, EventArgs e)
    {
        Response.Redirect("Login.aspx");
    }

请帮助我解决这个问题。

为什么我的SQL数据库登录身份验证失败？

0 个答案: