Update panel and IE, ashx

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IE7

IE

UpdatePanel

ASHX

Hey Guys,

I have an asp.net web application and I am getting everything to fire with the newly added update panel except my ashx method. It will not fire or render, below is the code and any help would be great. It will work in Chrome and get called in chrome but not IE

switch (iProof)
            {
                case -1:
                    imgProof.ImageUrl = sb.ToString();
                    break;
                case 0:
                    Session["H"] = imgProof.Height;
                    Session["W"] = imgProof.Width;
                    Session["B"] = imagename.ToString();
                    Session["S"] = sb.ToString();
                    imgProof.ImageUrl = "PShandler.ashx";
                    break;
                case 1:
                    imgProof.ImageUrl = sb.ToString();
                    break;
            }

specifically case 0