how to check Validation Web API

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C#

ASP.NET

REST

Dear All,
how can i check validaion on data dictionary attributes for example check if Firstname and last name is not null or length>0 using Model Validation in ASP.NET Web API

public HttpResponseMessage Post([FromBody] List<Dictionary<string,string>> _lstDicobject)
      {
//JsonConvert.DeserializeObject<Person>(JsonConvert.SerializeObject(kvpList)) object (person) data type
return JsonConvert.DeserializeObject<Person>(JsonConvert.SerializeObject(kvpList)).sendMail();
     }

where person class

class person {
public string Firstname {set ; get;}
public string lastname {set ; get;}
public string send mail()
{
return Firstname+" "+ lastname;
}
}