ASP.NET Issue - iFrame Posting

On my website I've got input box that sends a few variables to an iframe. These variables are "Arrival Date", "Departure Date", "Nights", "Adults", "Ages", "Children" and "Infant". When the button "Check Availability" is clicked the variables are appended to an iframe URL. It works fine in Firefox and Chrome, but does not work in Internet Explorer. I've attached an image of what the input box looks like and I've pasted the code behind the input box below. public partial class ctlBookingWidget : [login to view URL] { protected void Page_Load(object sender, EventArgs e) { } protected void btnSubmit_Click(object sender, EventArgs e) { var arrival = [login to view URL]; var departure = [login to view URL]; var people1 = [login to view URL]; var people2 = [login to view URL]; var people3 = [login to view URL]; var people4 = [login to view URL]; Session["iframeSourceURL"] = @"[login to view URL] " + arrival + "&Departure=" + departure + "&People1=" + people1 + "&People2=" + people2 + "&People3=" + people3 + "&People4=" + people4; [login to view URL]("/[login to view URL]"); Take a look at the 2 URLs below that I've pulled from Internet Explorer and one from Firefox. I inserted the arrival date of 4/15/2014 and a departure date of 4/17/2014 Here is what I found in the "view source" for Internet Explorer ( Notice that there is no date values ) <iframe src="[login to view URL]" seamless width="1000px" height="950px" marginheight="0" marginwidth="0" frameborder="0" allowTransparency="true"/> Here is what I found in the "view source" for FireFox ( Notice that there IS date values passed ) <iframe src="[login to view URL]" seamless width="1000px" height="950px" marginheight="0" marginwidth="0" frameborder="0" allowTransparency="true"/> Do you know what the problem is with Internet Explorer that's causing or preventing the date's from being sent through? You MUST have excellent feedback and I kindly ask that you do NOT bid unless you are fully confident that you can solve this issue. This is a micro-project - please bid reasonably.