This is just a quick post to show how to get image URL via code behind.

This is mostly useful when you are binding children items to a repeater or returning image URL in a JSON webservice

public static string GetImageURL(Item currentItem)
{
          string imageURL = string.Empty;
          Sitecore.Data.Fields.ImageField imageField = currentItem.Fields["Image"];
          if (imageField != null && imageField.MediaItem != null)
          {
            Sitecore.Data.Items.MediaItem image = new Sitecore.Data.Items.MediaItem(imageField.MediaItem);
            imageURL = Sitecore.StringUtil.EnsurePrefix('/', Sitecore.Resources.Media.MediaManager.GetMediaUrl(image));
          }
return imageURL;
}

Cheers