First you need to place an Image element (tag) in your aspx page.
<asp:image id="Image1" runat="server" xmlns:asp="#unknown" />
after you uploaded your image file successfully. You need to assign this image URL to that image element.
(imageElementID).ImageURL="../Upload/"+pc.Trim();
And also, you need to check the directory whether its exists or not before save file into it. so it'll be something like.
if(!Directory.Exists(Server.MapPath(@"~/Upload")))
Directory.CreateDirectory(Server.MapPath(@"~/Upload"));
FileUpload1.PostedFile.SaveAs(Server.MapPath(@"~/Upload/" + pc.Trim()));
does that solve your problem?