Sorry to sound impatient (I may yet have to open a support ticket) but I've been testing my application and I've run into a last minute IE11 compatibility problem.
I have a RadGrid that uses RadButtons as link buttons to download attached files from a database. This general set up has been in production for years now and has generally worked perfectly, in Chrome and Firefox. Unfortunately we've had a number of problems with IE and we had believed we had solved most of them by moving to a new server and this generally seems to be true, with one exception.
I cannot download files in IE. I get an error message saying file cannot be downloaded. If I retry it claims to have succeeded but what I get is a corrupted stub of a file.
The download process itself runs through the RadGrid's ItemCommand event handler and is so far as I know fairly conventional. I get the file as a string from the database, set the Current.Response.ContentType to whatever the file is (In this case "image/jepg"), then do an add header ( AddHeader("Content-Disposition", "attachment; filename=\"" + sAttachName + "\"") ) and finally a BinaryWrite of the byte array containing the file. As I said, this works perfectly in Chrome and Firefox.
It occurs to me that I've already had a problem like this earlier (http://www.telerik.com/forums/failure-of-download-links-after-ajaxifying-radgrid) and the code mentioned in that entry has not been changed in any way.
Suggestions?