Text.Transform Property

public Matrix Transform { get; set; }

using (var bitmap = new Bitmap(150, 150, PixelFormat.Format24bppRgb, RgbColor.White))
using (var graphics = bitmap.GetAdvancedGraphics())
using (var m = new System.Drawing.Drawing2D.Matrix())
{
    m.Rotate(30);
    var plainText = new PlainText("Plain Text", graphics.CreateFont("Arial", 28), new System.Drawing.PointF(40, 40));
    plainText.Transform = m;
    graphics.DrawText(plainText);
    bitmap.Save(@"Images\Output\out.png");
}