Request Body With The Json Gives Null While Using Fiddler. How Do I Solve It

See more:

OData

I am using odata controller in mvc.
While i am sending json data from ajax post method controller takes null value for properties of class

my code like

{"Id":"DdZLFwNe7vQ"
,"ExternalInvestorId:"F1/11/Y14",
"AppKey":"5BB9B50E-AA2C-498B-B895-1E83827CE9F5",}

in odatacontroller post method

public void Post([FromBody]InvestorUpdate Inv)
{

}

public class InvestorUpdate
{
public string Id { get; set; }
public string ExternalInvestorId { get; set; }
public string AppKey { get; set; }
}

Inv takes null value for its three properties