mvc3 validate input 'not-equal-to'

Question

My forms have inputs with default helper text that guides the user on what to enter (rather than using labels). This makes validation tricky because the input value is never

Answer 1

It took a little while since your question was asked, but if you still like data annotations, this problem can be easily solved using this library:

[Required]
[AssertThat("FieldA != 'some text'")]
public string FieldA { get; set; }

Above, the field value is compared with some pre-defined text. Alternatively, you can compare fields values with each other:

[AssertThat("FieldA != FieldB")]

...and when the case of the strings being compared does not matter:

[AssertThat("CompareOrdinalIgnoreCase(FieldA, FieldB) != 0")]