This was driving me nuts earlier today, so this post is a kind of reminder to myself not to forget this again: When using Routing in .NET 4 always remember to add exceptions for axd files! Example: [code]routes.Ignore("{resource}.axd/{*pathInfo}")[/code] In my case I could not get standard .Net Field Validation to work client side. It was… Continue reading .NET Client Side Field Validation not working