iFrame parser error after upgrading to .NET 4.5

Question

We have recently upgraded all of our WebForms projects to .NET 4.5, and encountered a parser issue when loading pages with an iFrame element. We have corrected

Answer 1

From .NET 4.5, Microsoft decided to change the iframe from a HtmlGenericControl to its own control, a HtmlIframe. so you have to change the

System.Web.UI.HtmlControls.HtmlGenericControls to System.Web.UI.HtmlControls.HtmlIframe