Build Json String With Variable Data

I need to make an API call to a url giving it a json string in this format (ignore the line numbers, of course):

Code:
1. {
2. "properties": [
3. {
4. "property": "email",
5. "value": "new-email@hubspot.com"
6. },

[Code] ....

I want to create a class with these properties so I can call a method for each record in our database and plug in the email, firstname, etc. I am having trouble with it because of the repetition of "property" each time. In other words, it doesn't fit the mold of this example I found:

Code:
using System;
using System.Web.Script.Serialization;
public class MyDate
{
public int year;

[Code] ....

which produces:

Code:
{
"firstName": "Markoff",
"lastName": "Chaney",
"dateOfBirth": {
"year": 1901,
"month": 4,
"day": 30
}
}