cosmosdocumentcreate.cs

//create document
var volcano = new Volcano
              {
                  VolcanoName = "Rainier",
                  Country = "United States",
                  Region = "US-Washington",
                  Location = new Location
                  {
                      Type = "Point",
                      Coordinates = new double[] { -121.758, 46.87 }
                  },
                  Elevation = 4392,
                  Type = "StratoVolcano",
                  Status = "Dendrochronology",
                  LastEruption = "Last known eruption from 1800-1899, inclusive"
              };

var document = await client.CreateDocumentAsync(
                     UriFactory.CreateDocumentCollectionUri(dbName,collectionName)
                     ,volcano);