First create normal aspx page then call iframe like
<iframe id="sample" frameborder="0" src="YourPageName.aspx" height="300px" style="width: 100%;" scrolling="auto"></iframe>;
Then you call the iFrame Contents through javascript.
For Example i am using upload control inside the iFrame page. I access the control using client side code
var iFrameId = document.getElementById('sample');
var fraContent = iFrameId.contentDocument || iFrameId.contentWindow.document;
var uploadTxt = fraContent.getElementById('FU_ReplyMail').value;