Remove C# attribute of a property dynamically

You can not remove the attribute at runtime, but you can use reflection to change the ReadOnly attribute's ReadOnly private backing field to False. Making it the equivalent of [ReadOnly(false)]

See this article for details:

http://codinglight.blogspot.com/2008/10/changing-attribute-parameters-at.html

Edit: fixed link

I have to agree w/ Omu; you're really talking about two classes (view models) in this case, to support your two different views. Something like

CreateContactViewModel and EditContactViewModel

it's not possible at the moment to remove attributes dinamycally (at runtime)

as a suggestion you can do 2 classes: one with the attributes and one without

The CodingLight.com blog moved to blogspot (the above link is broken). See http://codinglight.blogspot.com/2008/10/changing-attribute-parameters-at.html.

Moreover, SysAdmin's followup did not mention the [RefreshProperties(RefreshProperties.All)] attribute that seems to be necessary for an actually-working solution.

Finally, I believe that even David Morton (author of the quoted article) missed one very important thing: if the class (ContactInfo, in SysAdmin's followup example) does not have at least one property with the [ReadOnly] attribute defined at compile time, then when the "isReadOnly" FieldInfo is set to true at runtime the result is that the whole class turns read-only.