Based on the code posted in the comments, you're missing the path of the file in the image tag:
<img src="@Url.Content("~/uploadcv/" + item.resume)" height="25px" width="50px" />
Or, if you're using MVC4 or higher:
<img src="~/uploadcv/@item.resume" height="25px" width="50px" />
However, the upload code you've posted doesn't seem to verify that the uploaded file is actually an image. If the user has uploaded a different file type - for example, a Word document - then you can't display it in an
<img>
tag.