WCF Service Reference - Getting “XmlException: Name cannot begin with the '<' character, hexadecimal value 0x3C” on Client Side

Question

I have a smart client application communicating with its server via WCF. Data is created on the client and then sent over the service to be persisted. The server and client use

Answer 1

In my case, one of the classes had a property, whose datatype was object. Something like this:

public class BuyAddOnServiceRequest
{
    object site_id
}

after changing this to:

public class BuyAddOnServiceRequest
{
    string site_id
}

it worked!