I want my detailsview validationsummary to display all the errors in the user's input, in one popup screen....but you're saying that due to their different behaviours that won't be possible?

Not without a lot of custom programming. The other controls are validated at the client and result in a message box being shown *before* the page posts back. The Calendar is validated at the server after a postback and doesn't result in the ValidationSummary displaying a message.

If you want to group all errors, you have many options, including:

1. Don't use client side validation and display all error messages as HTML after a postback using the ShowSummary setting of the Validation Summary

2. Use the above, but implement client script that alerts the contents of the validation summary after a postback.

Alternatively, use a different Calendar (from the AJAX toolkit for example: http://wiki.asp.net/page.aspx/417/calendar-extender/ or from jQuery UI: http://jqueryui.com/demos/datepicker/) that works with client side validation as well. Then you can write a client function for the CustomValidator control to inject the error message in the alert box.

Cheers,

Imar

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Imar Spaanjaars
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Author of Beginning ASP.NET 4.5 : in C# and VB, Beginning ASP.NET Web Pages with WebMatrix
and Beginning ASP.NET 4 : in C# and VB.
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