SOLVED
Hi,
i've a grid where my email field isn't shown (must not be) , when editting the popup cannot be save due an error of a invalid EmailAddress.
Field isn't requierd, so an empty field should possible , i thought.
Model:
[MaxLength(150)]
[EmailAddress]
public string emailaddress { get; set; }
i used : https://demos.telerik.com/blazor-ui/grid/custom-editor as starting point
database wasn't correct