The message The value '' is not valid for

[zandiarash]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

I have a Blazor web application which uses System.ComponentModel.DataAnnotations attribute for validation in a registration form .
I have a property named NationalCode which is nullable long
I did not added [Required] attribute above my NationalCode property
But when I want to submit the form if I leave the field NationalCode empty this validation message appears :
"The value '' is not valid for 'NationalCode'."

If I change my code and add [Required] attribute like this :

[Required(ErrorMessage = "Please Enter your national code", AllowEmptyStrings = true)]
public long? NationalCode { get; set; } = null;

Two message appears :

- "The value '' is not valid for 'NationalCode'."
- "Please Enter your national code"

This is my codes :

<div class="form-floating">
    <InputNumber @bind-Value="Input.NationalCode" autocomplete="nationalCode" aria-required="true" />
    <label for="family">NationalCode</label>
    <ValidationMessage For="() => Input.NationalCode" class="text-danger" />
</div>

 private sealed class InputModel
 {
     public long? NationalCode { get; set; }
 }

Expected Behavior

But I want only my message appear.
Where is the first message come from ?
How can I disable it ?

Steps To Reproduce

No response

Exceptions (if any)

No response

.NET Version

8.0.3

Anything else?

No response

[javiercn]

@zandiarash thanks for contacting us.

This is a dupe of #52195