how to create jpg file from given string

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VB

I have converted given string to JPG file format. But i need those image string in center. Iam getting output from leftside of rectangle.

Dim stext As String = "Testing"
           Dim format As StringFormat = New StringFormat()
           Dim MyRect As Rectangle = New Rectangle(0, 0, 400, 800)
           Dim MyGraphics As Graphics = Me.CreateGraphics()
           Dim MyImg As Image = New Bitmap(391, 132, MyGraphics)
           Dim imageGraphics As Graphics = Graphics.FromImage(MyImg)
           imageGraphics.FillRectangle(Brushes.White, MyRect)
           format.Alignment = StringAlignment.Center
           format.LineAli`enter code here`gnment = StringAlignment.Center
           imageGraphics.DrawString("Testing", New Font("Times New Roman", 30, Drawing.FontStyle.Bold), Brushes.Black, RectangleF.op_Implicit(MyRect))
           MyGraphics.DrawImage(MyImg, MyRect)
           MyImg.Save(Destfilename & "/"  & "test.jpg")

I have given this code output. But i need this string to in center position. How to do, Kindly help me through.
Output: https://drive.google.com/file/d/0B_nzYHWVJJ7Ka3N0V2NmRnl3UFk/view?usp=sharing[^]