为什么我在asp图像控件中的图片看起来被压扁了？

I have an asp.net c# web page. On the page I have a image box which will randomly display an image every 5 secs or so. The problem is, some of the pictures appear squashed. All of the pictures have been cropped in photoshop to 350x350 pixels and the size of the image box is 350x350 pixles. If you look at the pictures using another program they look fine, but on the asp.net page they look funny. Can someone show me where I'm going wrong?I have an asp.net c# web page. On the page I ha