ASP. Updatemodel empty non-filled argument is null, why is not an empty string

Looked for a long time, finally received the reason:

if (bindingContext.ModelMetadata.ConvertEmptyStringToNull && object.equals (value, String.Empty)) {return Null }

Null is returned when the model's metadata is convertemptystringtonull to true and the value of the form is an empty string.

The solution is to set [DisplayFormat (ConvertEmptyStringToNull = false) on the model's related property]

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2 Solutions Add Attribute on the properties of 1.model

[DisplayFormat (ConvertEmptyStringToNull = False)] public string Name {get; set;}

2. Defining Model Binding Classes

ASP. Updatemodel empty non-filled argument is null, why is not an empty string