AlternateText: alternate text for the image required for accessibility. DescriptionUrl: a link to a page that contains a detailed description of the image (required to make a complex image accessible). GenerateEmptyAlternateText: set the AlternateText property to an empty string. ImageAlign: align the image relative to other HTML elements in the page. Possible values are AbsBottom, AbsMiddle, Baseline, Bottom, Left, Middle, NotSet, Right, TextTop, and Top. ImageUrl: specify the URL to the image. <%@ Page Language="C#" %> "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> void Page_Load() { Random rnd = new Random(); switch (rnd.Next(3)) { case 0: imgRandom.ImageUrl = "Picture1.gif"; imgRandom.AlternateText = "Picture 1"; break; case 1: imgRandom.ImageUrl = "Picture2.gif"; imgRandom.AlternateText = "Picture 2"; break; case 2: imgRandom.ImageUrl = "Picture3.gif"; imgRandom.AlternateText = "Picture 3"; break; } }