.Net FindControl - find your html controls

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Sometimes the FindControl method won't find your control, if its on the masterpage or if its inside a contentplace holder.

To fix this:

ContentPlaceHolder cph = this.Form.FindControl("ContentPlaceHolder1") as ContentPlaceHolder;
HtmlControl myFrame = (HtmlControl)cph.FindControl("iframe01");
myFrame.Attributes["src"] = url_geo;

or

HtmlControl myFrame = (HtmlControl)this.Master.FindControl("controlid");

Source:
http://csharporcas.blogspot.com/2006/05/master-page-find-control.html

P.S.: Your iframe may need the runat="server" tag for this to work!

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