Clash Royale CLAN TAG

@Html.ValidationMessageFor() required field displaying message when populated

I am currently using ASP.net MVC (VB).

I have a model with the following property:

<Required(ErrorMessage:="Contact name is required")>
Public Property contact_name() As String

<Required(ErrorMessage:="Contact name is required")>

Public Property contact_name() As String

In my controller method (accepts a post request and binds various parameters to the model) I set contact_name from two other parameters :

model.contact_name = first_name + " " + last_name

model.contact_name = first_name + " " + last_name

I return to my view containing a form which has an input field with a value of model.contact_name
and I use the tag

model.contact_name

@Html.ValidationMessageFor(Function(model) model.contact_name

@Html.ValidationMessageFor(Function(model) model.contact_name

The problem is that the error message is always displayed, unless the POST request has the parameter: contact_name. Even if the error message is displayed, if I submit the form the model is valid. (modelState.isValid == true).

contact_name

modelState.isValid == true

Since I set the value of model.contact_name and pass the model to the view, technically, the model state should be valid, the required property contact_name is not null or blank and the validationMessageFor the contact_name property should not be appearing.

Why it is appearing?
How do I stop it from appearing if the value of model.contact_name is not blank?

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