Jon below is an extract from Docuware provided sample for placing annotations. I added - in bold - the color modifier. Please note, the desiredcolorvalue is a 6-digit Hex number representing RGB color code (examples #000000 is Black, #FF0000 is RED, ##00FF00 is Green)
var annotations = new Annotation()
{
Layer = new List<Layer>()
{
new Layer()
{
Id = 1,
Items = new List<EntryBase>()
{
//Annotation that contains text
new TextEntry()
{
Color = desiredcolorvalue,
Location = new AnnotationRectangle()
{
Left = 100,
Top = 100,
Width = 200,
Height = 200
},
Value = "AutoTest",
Font = new Font()
{
FontSize = 10*20,
FontName = "Arial"
}
},