Json Error With [DisplayFormat(ConvertEmptyStringToNull = false)]

Question

I Write a mvc5 project in vs2013

A method in controller returns json

public JsonResult QueryConcens(ConcentratorView concenForQuery)
{
    QueryConcentratorsRequest request = new QueryConcentratorsRequest() { ConcenQuery = concenForQuery };

    return
        Json
        (
            concenstratorService
            .QueryConcentrators(request)
            .ConcensView
        );
} 

the model is

public class ConcentratorView
{
    [Required(ErrorMessage="please input id")]
    public string ConcentratorID { get; set; }

    public string Name { get; set; }

    public string Address { get; set; }
}

it returns:

[{"ConcentratorID":"43","Name":"345","Address":"345"},
{"ConcentratorID":"56","Name":"","Address":null},
{"ConcentratorID":"concen_123","Name":"wer","Address":null}]

I want the Address:null to be ""

then I Add

[DisplayFormat(ConvertEmptyStringToNull = false)]
public string Address { get; set; }

but it returns

[{"ConcentratorID":"43","Name":"345","Address":"345"}]

it losts two rows

Why?