由于用户不存在/密码/用户名正确而导致尝试登录网站失败时如何返回消息？

Question

I built a website as my project for school. I built a registration system, but I have a problem: I want the user to recive a message from the server when the login proccess fails, and everything goes right, except from the message. Somehow, though everything is right, the user doesnt get any message from the server at all. He is only redirected, as the code is programmed. I followed the course of events and it seems that it should show a message, but in reality its not.

Im using aspx.

MasterPage.aspx:

<section>
<table id='tblog' border='0'>
    <%=hello %>
    <%=logIn %>
    <%=topPanel %>
    <%=msgError %>
    </table>
</section>

MasterPage.aspx.cs

public string msgError = "";
if  (Request.Form["submit1"] != null)
{

    nameen = Request.Form["nameen"];
    password  = Request.Form["password"];

    query = "select * from Users";
    query += " WHERE Name  = '" + nameen + "'";
    query += " AND PWD  = '" + password + "'";


    SqlDataReader data = DalBll.DataReadSQL(DalBll.GetConnection(), query);
    if (data.Read())
    {
        ///(I DELETED THIS PART)
    }
    else
    {
        msgError += "<tr><td colspan='2'><div>WRONG PASSWORD/USERNAME</div></td></tr>";
    }
    Response.Redirect("Default.aspx");
}

Answer 1

There are many documented ways to display information to the user. One way to do this is to use a javascript alert.

Replace Response.Redirect() with this:

ClientScript.RegisterStartupScript(this.GetType(), "myalert", "alert('" + msgError + "');", true);