Atur lebar gambar secara dinamis dengan Eval di ASP.NET

Gunakan System.Web.UI.WebControls.Unit.Parse metode:

<asp:Image 
      ID="Image1" 
      runat="server" 
      Width='<%# System.Web.UI.WebControls.Unit.Parse(Eval("ImageSize").ToString()) %>'
      ImageUrl="~/Images/ProgressBar.jpg"/>