How to check if text is over the size for the TextVObject

System.Drawing.RectangleF ctRect = new System.Drawing.RectangleF(0, 0, 200, 50);
string str = "Aurigma";

//set Aurigma Font class
Aurigma.GraphicsMill.Drawing.Font font = new Aurigma.GraphicsMill.Drawing.Font("Arial", 20);

//set TextVObject
Aurigma.GraphicsMill.WinControls.TextVObject cptxtObj = new Aurigma.GraphicsMill.WinControls.TextVObject(str, font.Name, font.Size, ctRect);

//count chars in str
int count = 0;
foreach (char c in str)
{
  count++;
}

//calculate (avarage) width of string
float stringwidth = count * font.AverageCharWidth;