Creating clickable links in runtime of c# aspx webform

Question

I'm creating asp links using response.write in c#, the same HyperLink code works smoothly when inserted directly in the asp code, but when i copy/paste it to the response.write("...") it appears as an unclickable black text.

Am i forgetting something?

<asp:HyperLink ID='HyperLink1' runat='server' NavigateUrl='Exibe.aspx'> CLICK HERE </asp:HyperLink>

this exact code above thrown in the aspx source works greatly

response.write("<asp:HyperLink ID='HyperLink1' runat='server' NavigateUrl='Exibe.aspx'> CLICK HERE </asp:HyperLink>");

and this turns into a black text

another issue if you let me.. i have to figure a way to send a string in my code along in the querrystring of my <a> link.. and it wont let me concatenate the link code.. — Marcelo
– Marcelo, Commented Nov 30, 2009 at 12:06

slugster · Accepted Answer · 2009-11-30 11:40:55Z

2

You cannot insert an asp:Hyperlink tag directly into the response stream like that, as the hyperlink is actually a control that needs to "render" itself (if you replaced that with a normal "a" anchor/hyperlink tag it would work fine).

Instead you need to either create the control and add it to the page programatically, or maybe use a repeater control to render the anchors.

answered Nov 30, 2009 at 11:40

slugster

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2 Comments

Marcelo Over a year ago

my problem is.. this isn't the exact code, just a simpler one. i'm gonna use querrystrings, so the hyperlinks are gonna have to be created at runtime.

Marcelo Over a year ago

hah.. nevermind. i've noticed querrystrings work with <a>.. thank you!

Dmytrii Nagirniak · Accepted Answer · 2009-11-30 11:53:37Z

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You are trying to do totally different things:

the markup (asp:HyperLink) will be compiled.
the Response.Write("asp:HyperLink") will NOT. It will render text as is, and of course you wont't see any link, in fact you should see the text inside the tag asp:HyperLink (inluding the tag itself in the HTML source).

If you want to create a link dunamically you can do it using code snippets below:

<asp:HyperLink ID='HyperLink1' runat='server' NavigateUrl='<%= GetDynamicUrl() %>'> CLICK HERE </asp:HyperLink>
/// Or plain HTML
<a href="<%= GetDynamicUrl()"><%= GetTheLinkText() %></a>

answered Nov 30, 2009 at 11:53

Dmytrii Nagirniak

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2 Comments

Marcelo Over a year ago

well.. it has worked with normal <a> link.. but as i'm learning, i'm curious now.. this "GetDynamicUrl" runs in HTML.. i've never heard of it, where is it from ?

Dmytrii Nagirniak Over a year ago

It is the public/protected method on the code-behind file (where you write your C# or VB.NET code). This method can return anything you want dynamically and is executed on the server

PhilPursglove · Accepted Answer · 2009-11-30 11:55:34Z

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If you want to generate a hyperlink dynamically on the server-side like this, you can either use Response.Write with an <a> tag like slugster says, or alternatively consider the ASP:Literal control which renders exactly what you give it even if it contains markup e.g.

In your markup:

<asp:literal runat="server" id="MyLiteral" />

In your code:

string myHTMLFragment;

myHTMLFragment = "Hello. I am a link pointing to <a href="http:stackoverflow.com">StackOverflow</a>";

MyLiteral.Text = myHTMLFragment;

answered Nov 30, 2009 at 11:55

PhilPursglove

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