how to sending class object in postman?

Question

i have create one web services.

that service in one parameter is class.

how to pass postman parameter in class object. 

 

it's my code. 

[WebMethod]

[ScriptMethod(ResponseFormat = ResponseFormat.Json)]

public List<strudent> SaveOrder(strudent stud)

{

var list=new List<strudent>();

list.Add(stud);

return list;

}

 

 

//Class  

public class strudent

{

public string Fname { get; set; }

public string Lname { get; set; }

public string data { get; set; }

}