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Home/ Questions/Q 5976759
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Editorial Team
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Editorial Team
Asked: May 22, 20262026-05-22T21:16:26+00:00 2026-05-22T21:16:26+00:00

In my application a forms needs to be completed by inserting a phonenumber or

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In my application a forms needs to be completed by inserting a phonenumber or cellphonenumber. how do you make this possible in ASP MVC ?

   <MetadataType(GetType(Persoon_Metadata))> _
Partial Public Class Persoon

End Class


Partial Public Class Persoon_Metadata

    <DisplayName("Voornaam:")> _
    <Required(ErrorMessage:="Gelieve een voornaam op te geven.")> _
    <DisplayFormat(ConvertEmptyStringToNull:=False)>
    Property Voornaam As Object

    <DisplayName("Familienaam:")> _
    <Required(ErrorMessage:="Gelieve een familienaam op te geven.")> _
    <DisplayFormat(ConvertEmptyStringToNull:=False)>
    Property Familienaam As Object

    '<RegularExpression("[0-9]", ErrorMessage:="Het opgegeven telefoonnumer voldoet niet aan het gewenste formaat. (bv 050123456)")> _
    <DisplayName("Telefoonnummer:")> _
    <Required(ErrorMessage:="Gelieve een telefoonnummer op te geven aub")> _
    <StringLength(15, ErrorMessage:="Het opgegeven telefoonnummer voldoet niet aan het gewenste formaat. (bv 050123456)", MinimumLength:=9)> _
    <DisplayFormat(ConvertEmptyStringToNull:=False)>
    Property Telefoonnummer As Object

    '<Required(ErrorMessage:="Gelieve een gsmnummer op te geven aub")> _
    <DisplayName("GSM - nummer:"), DisplayFormat(ConvertEmptyStringToNull:=False)>
    <StringLength(15, ErrorMessage:="Het opgegeven gsmnummer voldoet niet aan het gewenste formaat. (bv 050123456)", MinimumLength:=9)> _
    Property Gsmnummer As Object

    <Required(ErrorMessage:="Gelieve een functie op te geven bv. directeur , technisch assistent ...")> _
    <DisplayFormat(ConvertEmptyStringToNull:=False)> _
    <DisplayName("Functie:")> _
    Property Functie As Object


End Class
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1 Answer

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  1. Editorial Team
    Editorial Team
    2026-05-22T21:16:27+00:00Added an answer on May 22, 2026 at 9:16 pm

    Seems you’ve hit on a case where attribute-based validation falls on its face. May I suggest that you check out Fluent Validation?

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