'...
'Create an instance of ImageElement class

Dim imgElem As Neodynamic.SDK.ImageElement
imgElem = Neodynamic.SDK.ImageElement.FromUrl("~/images/night.jpg")

'Create an instance of BitmapMask class

Dim fxBitmapMask As New Neodynamic.SDK.BitmapMask()
fxBitmapMask.MaskFile = "~/images/mask.png"

'Apply the action on the ImageElement

imgElem.Actions.Add(fxBitmapMask)

'Add the ImageElement to the Elements collection of the ImageDraw control

Me.ImageDraw1.Elements.Add(imgElem)
'...

//...
//Create an instance of ImageElement class
Neodynamic.SDK.ImageElement imgElem = Neodynamic.SDK.ImageElement.FromUrl("~/images/night.jpg");

//Create an instance of BitmapMask class
Neodynamic.SDK.BitmapMask fxBitmapMask = new Neodynamic.SDK.BitmapMask();
fxBitmapMask.MaskFile = "~/images/mask.png";

//Apply the action on the ImageElement
imgElem.Actions.Add(fxBitmapMask);

//Add the ImageElement to the Elements collection of the ImageDraw control
this.ImageDraw1.Elements.Add(imgElem);
//...

...
<neoimg:imagedraw id="ImageDraw1" runat="server">
   <Canvas AutoSize="True" />
   <Elements>
      <neoimg:ImageElement Source="File" SourceFile="~/images/night.jpg">
        <Actions>
            <neoimg:BitmapMask MaskFile="~/images/mask.png" />
        </Actions>
      </neoimg:ImageElement>
   </Elements>
</neoimg:imagedraw>
...