登录后显示用户名不起作用

Question

I am having trouble displaying the username after login on my index page.

The code I have for Logging in:

protected void btnLoginButton_Click(object sender, EventArgs e)
    {
        if (Membership.ValidateUser(UserName.Text, Password.Text))
        {
            // Log the user into the site
            Response.Redirect("~/Index.aspx");
        }
        // If we reach here, the user's credentials were invalid
        InvalidCredentialsMessage.Visible = true;
    }

Then in my Index Page:

<asp:Label runat="server" ID="WelcomeBackMessage">Label</asp:Label>

Code Behind:

protected void Page_Load(object sender, EventArgs e)
    {
        WelcomeBackMessage.Text = User.Identity.Name.ToString();
    }

The problem is that there are no errors and it is not displaying the name at all.

Thanks

Answer 1

You simply forgot to actually login your user. All you do is validating the users credentials and then do a redirect. So try to add the following line in your if-statement:

protected void LoginButton_Click(object sender, EventArgs e)
{
    // Validate the user against the Membership framework user store
    if (Membership.ValidateUser(UserName.Text, Password.Text))
    {
        // Log the user into the site
        FormsAuthentication.SetAuthCookie(UserName.Text, true);
        // Do the redirect
        Response.Redirect("~/Index.aspx");
    }
    // If we reach here, the user's credentials were invalid
    InvalidCredentialsMessage.Visible = true;
}

Answer 2

protected void btnLoginButton_Click(object sender, EventArgs e)
{
    if (Membership.ValidateUser(UserName.Text, Password.Text))
    {
        WelcomeBackMessage.Text = User.Identity.Name.ToString();
        // Log the user into the site
        Response.Redirect("~/Index.aspx");

Place WelcomeBackMessage label in master page and try this code.