I've been using Ajax controls for over a year in my asp.net project.
Recently I suddenly started getting the error "Could not load file or assembly 'AjaxMin, Version=4.97.4951.28478" when I ran the project. After some investigation I discovered this can be caused by a missing Ajaxmin.dll file. I located the file and copied it into my project's Bin folder where the AjaxControlToolKit.dll is. All well and good.
Except that since then, the problem has re-occurred twice - everything works find for a while and then suddenly the dll vanishes from the folder and I get the error again. I can fix it ok by copying it back in. But what would cause a DLL just disappear from my project's Bin folder?