Change href link in content place holder from C# code

Question

I have a content placeholder containing a link:

<asp:Content ID="Content5" runat="server"  contentplaceholderid="ContentPlaceHolder3">
<a href= "../WOPages/WO_Main.aspx?WONum=12345">WorkOrder</a>

and I would like to change the href querystring from code. How do I find it to change it?

Answer 1

If you add an id and a runat="server" attribute to your link...

<a id="YourLink" runat="server" href="../WOPages/WO_Main.aspx?WONum=12345">
    WorkOrder
</a>

...then you can access/change the HRef property programmatically...

YourLink.HRef = "http://stackoverflow.com/";

Answer 2

You could clear all controls from the ContentPlaceholder and then add a new hyperlink control like this:

// Create your hyperlink control
HyperLink lnk = new HyperLink();
lnk.NavigateUrl = "http://domain.com";
lnk.Text = "Click here";

ContentPlaceHolder3.Controls.Clear();
ContentPlaceHolder3.Controls.Add(lnk);

or give the hyperlink an Id and update the hyperlink by finding the control in the ContentPlaceholder:

HyperLink lnk = ContentPlaceHolder3.FindControl("MyLink") as HyperLink;
lnk.NavigateUrl = "http://domain.com/update/";
lnk.Text = "Click here too";

Answer 3

You could use render tags or do this:

<a href="<asp:literal id="hrefString" runat="server"></asp:literal>"

and assign the literal in code.