必须声明标量变量＆QUOT; @电子邮件和QUOT; [英] Must declare the scalar variable "@Email"

问题描述

我试图从数据库表值传递给一对夫妇的标签，其中电子邮件列中的电子邮件entered.I匹配已通过电子邮件使用session.Like从登录页面进入到这个页面。这：

I am trying to pass values from a database table to a couple of labels where the email column matches the email entered.I have passed the email entered from login page to this page using a session.Like This :

    protected void btnLogin_Click(object sender, EventArgs e)
    {
    if (AuthenticateUser(txtEmail.Text, txtPassword.Text))
    {
        FormsAuthentication.RedirectFromLoginPage(txtEmail.Text, chkBoxRememberMe.Checked);

        Session["Email"] = txtEmail.Text;
        Response.Redirect("~/Account.aspx");
     }

那么，我该会话值传递给lblEmail上ACOUNTS page.and然后我试图检索值名称，并从数据库TABEL'平衡'，其中电子邮件匹配一个在table.Like本：

then i am passing the session value to lblEmail on ACOUNTS page.and then i am trying to retrieve values 'Name' and 'Balance' from database tabel where Emails match the one in the table.Like This:

     protected void Page_Load(object sender, EventArgs e)
{
    lblEmail.Text = Session["Email"].ToString();
    string CS = ConfigurationManager.ConnectionStrings["ABCD"].ConnectionString;
    using (SqlConnection con = new SqlConnection(CS))
    {
        SqlCommand cmd = new SqlCommand("Select * from tblRegister where @Email = " + lblEmail.Text, con);
        con.Open();
        SqlDataReader rdr = cmd.ExecuteReader();

        rdr.Read();
        lblName.Text = rdr["Name"].ToString();
        lblBalance.Text = rdr["Balance"].ToString();


    }

但我得到一个错误消息，指出必须声明标量vraiable @Email下面的一行：

But i get a error message stating 'must declare the scalar vraiable @Email' on the line below:

   SqlDataReader rdr = cmd.ExecuteReader();

我究竟做错了什么？

What am i doing wrong?

推荐答案

尝试这样的而不是

  SqlCommand cmd = new SqlCommand("Select * from tblRegister where Email = @Email", con);
  cmd.Parameters.AddWithValue("@Email", lblEmail.Text);
  SqlDataReader rdr = cmd.ExecuteReader();
  //...

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