Assigning dynamic client Id of the Form to a Static Method Result

I have more than one user controls with the javascript functions. I set control Id to the client functio开发者_JAVA技巧n - to separate it from another. My javascript code looks like:

    function <%= this.ClientID %>UploadComplete(sender, args) {
....
}

And I want to register this method in the control declaration,

<ajaxToolkit:AsyncFileUpload runat="server" OnClientUploadComplete ="<%#uploaderror.ClientID%>UploadComplete"
        ID="AsyncFileUpload"/>

But in mark-Up I got

{"uploadComplete":<%#ClientID%>UploadComplete},"

Where uploaderror- I tried to use Attributes:

protected void Page_Load(object sender, EventArgs e)
{
    AsyncFileUpload.Attributes.Add("OnClientUploadComplete", this.ClientID + "UploadComplete");
}

Mark-up was good. But event didn`t fire.

So I have two questions: 1) Why <%# - dont works. 2) Why added by attributes events dont fired in javascripts?

Thank you.

---

For your first question, the reason it doesn't work is that you cannot mix databinding code and text in a server control's property as you have done. It has to be one or the other. So what you could do instead is:

OnClientUploadComplete='<%# uploaderror.ClientID + "UploadComplete"%>'