Suppress xsi:nil but still show Empty Element when Serializing in .Net

I have a c# class that has 20+ string properties. I set about a fourth of those to an actual value. I would like to serialize the class and get an output of

<EmptyAttribute></EmptyAttribute>

for a property

public string EmptyAttribute {get;set;}

I do not want the output to be

<EmptyAttribute xsi:nil="true"></EmptyAttribute>

I am using the following class

public class XmlTextWriterFull : XmlTextWriter
{
    public XmlTextWriterFull(string filename) : base(filename,Encoding.UTF8) { }

    public override void WriteEndElement()
    {
        base.WriteFullEndElement();
        base.WriteRaw(Environment.NewLine);
    }
}

so that I can get the full tags. I just don't know how to get rid of the xsi:nil.