{
	"odata.metadata": "http://portal.xpertdoc.com/odata/v4/$metadata#UserProfiles/@Element",
	"UserProfileId": "00000000-0000-0000-0000-000000000000",
	"Name": "username",
	"Roles": null,
	"FirstName": "John",
	"LastName": "Doe",
	"Email": "[email protected]",
	"CultureLcid": 4105,
	"TimeZone": "Eastern Standard Time",
	"IsSystem": false,
	"CreatedByUserProfileId": "00000000-0000-0000-0000-000000000000",
	"CreatedDate": "2016-01-01T00:00:00.0000000Z",
	"ModifiedByUserProfileId": "00000000-0000-0000-0000-000000000000",
	"ModifiedDate": "2016-01-01T00:00:00.0000000Z",
	"Timestamp": "AAAAAAAByp4="
}

var url = "http://portal.xpertdoc.com/odata/v4/UserProfiles(guid'00000000-0000-0000-0000-000000000000')";	
	
var values = new Dictionary<string, string>
{		
				{ "ValueToChange", "Value"},  
				{ "Name", "New Name"}	
};
var value = await Update(url, values);