To display an image, you probably need to make a directory in which you store your images in a virtual directory in IIS. After that, you can create a URL based on the file name. Example:
C:\UserImages\1234.jpg
UserImages , - :
string baseImgUrl = "http://myServer/UserImages/";
FileInfo fi = //load with the file path C:\UserImages\1234.jpg;
img_myImageControl.ImageURL = baseImgUrl + fi.FileName;
, .