Iteration #3 – Add form validationhttp://asp.netMon, 11 Apr 2011 11:28:39 GMTumbracoComments for Iteration #3 – Add form validationenComment Posted by hlpearlhttp://asp.net/mvc/tutorials/older-versions/contact-manager/iteration-3-add-form-validation-vbMon, 11 Apr 2011 11:08:48 GMT00000000-0000-0000-0000000012762Protected Sub ValidateContact(contactToValidate As Contact)

If contactToValidate.FirstName.Trim().Length = 0 Then

ModelState.AddModelError("FirstName", "First name is required.")

It appears to me, this test will ALWAYS fail with an "Object reference not set to an instance of an object" with the trim added to the variable name. Granted the trim needs to be added, but as written it appears to fail.

End If

]]>Comment Posted by hlpearlhttp://asp.net/mvc/tutorials/older-versions/contact-manager/iteration-3-add-form-validation-vbMon, 11 Apr 2011 11:28:39 GMT00000000-0000-0000-0000000012764As, written, when the FirstName is Null, the statement fails with an "Object reference not set to an instance of an object". But when changes to statemets as follows:

Function Create(<Bind(Exclude:="Id")> ByVal contactToCreate As Contact) As ActionResult

' Validation(logic)

If Len(contactToCreate.FirstName) = 0 Then

ModelState.AddModelError("FirstName", "First name is required.")

ElseIf Len(contactToCreate.FirstName.Trim()) > 0 Then

Else

ModelState.AddModelError("FirstName", "First name is required.")

End If

It works. If someones sees a different and/or better, please let me know?

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