How Do I Save A String Path File?

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C#

WCF

Hi. I am creating some contracts and implementing them in a WCF service. I have the following code:

public interface IContent
    {
        [OperationContract]
        bool AddContent(string description, string location, int userID);
    }
    [DataContract]
    public class ContentData
    {
        [DataMember]
        public String Description;

        [DataMember]
        public String Location;
    }

It is implemented as thus:

public bool AddContent(string description, string location, int userID)
{
    ...
}

When I run the service in the test client, and for location pass a path, such as:

E:\My Documents\Content\testcontent.txt

A DbEntityValidationException error is thrown with the Error Message: The Location field is required.

On debugging, the location parameter in the implementation comes in null.

When I try and pass a plain string for location without the path's '\', e.g. if I enter a value such as "This should work!", it works :-(..

How can is solve the backslash problem? I am confused on what could be wrong.