needs approach for authenticated users to access some resources

Question

User1052662409 posted

Hi All,

I have developed a website below is the header of website.

The website has some content which is accessible for for everyone.

This page also has a gridview with some data and a button field named  "Book".  I want only logged in users can access this button "Book"

What approach I should use? In header I am using <a href  >link for Sine In.

How can i change same <a href link> "Sine In" to "Log Out" after login?

I need only approach.

Answer 1

User753101303 posted

Hi,

Seems you are looking for System.Web.HttpContext.User.Identity.IsAuthenticated (and/.or IsInRole) to find out if this link should be shown. User Is also exposed as property for the Page control.

Edit: for web forms you also have the https://docs.microsoft.com/en-us/dotnet/api/system.web.ui.webcontrols.loginview?view=netframework-4.7.2 control

Answer 2

User-893317190 posted

Hi demoninside9,

It seems you want to control the ui of your page according to the user state.

If so , for the a link , you could try the syntax below.

<% presents the start of c# code , %> represents the end of c# code, you could insert  asp markup  between %> and <%,

then if user has logged in , logout link will show, else sign in link will show.

    <%
        if ( logic to determine whether the user has logged in )
        {
            %>
    <asp:LinkButton ID="LinkButton1" runat="server">logout</asp:LinkButton>
        <%}
            else
            {
                %>
    <asp:LinkButton ID="LinkButton2" runat="server">sign in</asp:LinkButton>
    <%
            }
        %>

But this syntax could not be used in gridview.

So I suggest you could use rowdatabound event to change the content of your gridview according to whether the user has logged in.

For example , you could write your aspx as follows .

<asp:GridView ID="GridView1" runat="server" OnRowDataBound="GridView1_RowDataBound">
        <Columns>
  <%-- omit other rows --%>
            <asp:TemplateField>
                <ItemTemplate>
                    <asp:Button runat="server" Text="Button" ID="book" />
                    <asp:Label ID="Label4" runat="server" Text="Please log in"></asp:Label>
                </ItemTemplate>
                
            </asp:TemplateField>
        </Columns>
    </asp:GridView>

Then in code behind you could 

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            if(e.Row.RowType == DataControlRowType.DataRow)
            {
                if (write your code to determine whether the user has logged in)
                {
                    e.Row.FindControl("book").Visible = true;
                    e.Row.FindControl("Label4").Visible = false;
                }
                else
                {
                    e.Row.FindControl("book").Visible = false;
                    e.Row.FindControl("Label4").Visible = true;
                }
               
            }
        }

Or you could directly remove the row is user hasn't logged in. using GridView.Columns.Remove

Best regards,

Ackerly Xu

Answer 3

User1052662409 posted

 <asp:LinkButton ID="LinkButton2" runat="server">sign in</asp:LinkButton>

It is not a Linkbutton, it's a href link <a class="page-scroll" data-toggle="modal" data-target="#myModal" href="#">Sine In</a>

Answer 4

User-893317190 posted

Hi demoninside9,

It could also applies to a href link.