Hi I post an javascript object to asp.net web API,in that object some property value is blank like bellow

var o={
ID=1,
Fname="Tom",
Mname="",
Lname="Wilson"
}

but in web API model binding Mname blank value change as null .I don't want this ,I want original value in API model.

please help me ,how do I do this?Is there any option for javascript?