asp.net login page for beginner

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I know that it's a basic question about learning ASP.NET, I had searched on Google, StackOverflow, MSDN and CodeProject but nothing was found for my result.

I'm using ASP.NET (C#) to design a page default.aspx within 2 textboxes and a button (username, password and submit).

After login successfull,

C#

Response.Redirect("userprofile.aspx");

will redirect me to the page.

Here is my question: On the page userprofile.aspx, if I click a link to move to default.aspx, "How to change 2 textboxes and a button (disable or disappear on page default.aspx) by 2 links "Hi, username" and "Logout"?

Thank you!

Posted 25-Mar-15 1:13am

user8x86

Updated 25-Mar-15 1:19am

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Nathan Minier 25-Mar-15 7:24am

In general? Either using a cookie or by using a session. A session is a more common solution, and is exceedingly easy to implement using an if(Session["loginname"] != null) else type constructs.

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Member 9005169 · Answer 1 · 2015-03-25T01:42:00

If you want create simple login panel in c# with two textbox like emailid and password and button control for 'Login' then write below code in button click event in your page

c# Code here

<blockquote class="quote"><div class="op">Quote:</div>string Query = "Select * from tblLogin where emailid='" + txtEmailID.Text + "' and password='" + txtPassword.Text + "'";

SqlDataAdapter adp = new SqlDataAdapter(Query,con);

DataSet ds = new DataSet();

adp.Fill(ds);

if (ds.Tables[0].Rows.Count > 0)

{

lblErrorMsg.Text = "Successfully login";

}

else

{

lblErrorMsg.Text = "EmailID/Password Incorrect";

txtEmailID.Focus();

}</blockquote>



for full details go to this link ....i hope this link will helpful for you

http://aspdotnet-alam.com/Article/how-to-create-login-page-with-proper-validation-and-remember-me-functionality-using-Asp-Net-C-Sharp-1.aspx

F-ES Sitecore · Answer 2 · 2015-03-25T01:49:00

It's better to use asp.net membership, or identity to do these things, but if you are doing this is a learning task then you can store if the user is logged in using the Session. Store their ID or username, and if you need to know if they are logged in check to see if the relevant session variables have a value.

A handy way to show\hide certain elements depending on if someone is authenticated is to use placeholders which you make visible or hidden depending.

XML

<asp:PlaceHolder ID="placeAuthenticated" runat="server" Visible="false">
    <div>Hello <%=Session["Username"] %> (<asp:HyperLink ID="linkLogout" runat="server" NavigateUrl="~/Logout.aspx">logout</asp:HyperLink>)
    </div>
</asp:PlaceHolder>

<asp:PlaceHolder ID="placeAnonymous" runat="server" Visible="true">
    <asp:Button ID="cmdLogin" runat="server" Text="Login" OnClick="cmdLogin_Click" />
</asp:PlaceHolder>

C#

protected void Page_Load(object sender, EventArgs e)
{
    if(!string.IsNullOrWhiteSpace((string)Session["Username"]))
    {
        placeAnonymous.Visible = false;
        placeAuthenticated.Visible = true;
    }
}

protected void cmdLogin_Click(object sender, EventArgs e)
{
    // ensure the user is valid, if so store their username, or userid (or both)
    // in the session
    Session["Username"] = "user1";

    Response.Redirect("test.aspx"); // this page just redirects to itself for simplicity
}

asp.net login page for beginner

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