The type or namespace name 'SoapFormatter' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'Soap' does not exist in the namespace 'System.Runtime.Serialization.Formatters' (are you missing an assembly reference?)



The type or namespace name 'SoapFormatter' could not be found (are you missing a using directive or an assembly reference?)

Add the following reference to the project to solve the error