The System.ComponentModel.DataAnnotations.ValidationResult class was created for RIA Services, and it was introduced in Silverlight 3.0 and then added into .NET 4.0.  A ValidationResult represents a validation error condition, specifying the error message and, optionally, any member names that the error corresponds to.  If you use the [Required] attribute, the [Range]... [Read More]

When I laid out my commitments for the current fiscal year, I included “Ship RIA Services Source Code” as a stretch goal.  Pulling this off will require a ton of effort.  I’ll have to work with management up several levels, with our legal department, and with dozens of others to... [Read More]

Here are some of the pictures I took while in LA for PDC09.  I had a great time and I hope that I get the chance to attend more conferences. The Standard has its name upside down for the logo. I tried to take a picture of the desk at... [Read More]

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With the RIA Services July 2009 Preview release, we heard significant feedback about the DomainDataSource error handling story.  The biggest problem was when errors occurred during Load() or SubmitChanges(), server-side errors would be silently swallowed unless you opted into the LoadError, LoadedData, and SubmittedChanges events, and explicitly checked for errors. ... [Read More]