{
	"odata.metadata": "http://portal.xpertdoc.com/odata/v4/$metadata#ContentMetadataForms/@Element",
	"ContentMetadataFormId": "00000000-0000-0000-0000-000000000000",
	"ContentLibraryId": "00000000-0000-0000-0000-000000000000",
	"Name": "Name",
	"Description": null,
	"Metadata": "<Form><Group DisplayMode='Minimal' Expanded='true' Label='Default' Name='Default'><Fields/></Group></Form>",
	"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": "AAAAAAAEqhM="
}

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