How to make role based control in ASP.NET without using authentication in web.config

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Hi I want to do Role based authentication in login page,without using without using authentication in web.config file.Is that possible with C# codes?

What I have tried:

C#

<pre>protected void btlogin_Click(object sender, EventArgs e)
        {
            cn.Open();
            SqlCommand cmd = new SqlCommand("Select * from Adduser where Username =@username and Password=@password", cn);
            cmd.Parameters.AddWithValue("@username", txtUserName.Text);
            cmd.Parameters.AddWithValue("@password", txtPwd.Text);
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataTable dt = new DataTable();
            da.Fill(dt);
            
            if (dt.Rows.Count > 0)
            {

                Response.Redirect("Default.aspx");
            }
            else
            {
                ClientScript.RegisterStartupScript(Page.GetType(), "validation", "<script language='javascript'>alert('Invalid Username and Password')</script>");

            }
        }

My aspx

ASP.NET

<pre><form id="form1" runat="server">
        
        <fieldset style="width: 270px; height: 174px; margin-left: 345px">
<legend class="auto-style1">Login</legend> 
<div class='container'>
<asp:Label ID="Name" runat="server" Text="UserName:" CssClass="lbl"/>
<br/>
<asp:TextBox ID="txtUserName" runat="server" ValidationGroup="lgn" Height="22px"/>
<asp:RequiredFieldValidator ID="RV1" runat="server" ValidationGroup="lgn"
                            ControlToValidate="txtUserName" 
                            ErrorMessage="Please Enter User Name" 
                            SetFocusOnError="True" style="color: #FF0000">*
</asp:RequiredFieldValidator><br />
</div>
 
<div class='container'>
<asp:Label ID="lblPwd" runat="server" Text="Password:" CssClass="lbl"/>
<br/>
<asp:TextBox ID="txtPwd" runat="server" TextMode="Password"  ValidationGroup="lgn"
                         CssClass="pwd" Height="22px"/>
<asp:RequiredFieldValidator ID="RV2" runat="server" 
                            ControlToValidate="txtPwd"
     ValidationGroup="lgn" 
                            ErrorMessage="Your Password" 
                            SetFocusOnError="True" style="color: #FF0000">*
</asp:RequiredFieldValidator><br />
</div>
            <tr>
                <td style="width: 360px"></td>

                <td>
                    <asp:Button ID="btlogin" runat="server" Text="Login"  ValidationGroup="lgn" OnClick="btlogin_Click" />
                    <asp:Button ID="btnsp" runat="server" Text="SignUp" OnClick="btnsp_Click" />

                </td>

            </tr>
        
    </form>

HTML

<pre>The below are the ids of the pages::

              
            

                 <a id="menu1" href="Default.aspx">Home</a>
                <a id="menu2" href="Add%20User.aspx">Add User</a>
                <a id="menu3" href="Registrationpage.aspx">Register Employee</a>
                <a id="menu4" href="Contact.aspx">Contact</a>

Posted 2-Feb-17 23:19pm

Member 12605293

Updated 2-Feb-17 23:54pm

v2

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Karthik_Mahalingam · Answer 1 · 2017-02-02T23:37:00

The user has an option to enter the "Default.aspx" url directly in the browser address bar, by doing so the security fails.
To avoid this situation you will have to store the authenticated key in a session and use it across the page load method of all the pages for validation.

Login page

C#

da.Fill(dt);
             Session["isValidUser"] ="0";
            if (dt.Rows.Count > 0)
            {
                Session["isValidUser"] ="1";
                Response.Redirect("Default.aspx");
            }

Other page:

C#

protected void Page_Load(object sender, EventArgs e)
        {
            if(Session["isValidUser"] !="1")
            {
                Response.Redirect("ErrorPage.aspx");
            }
            // your code....