AutoCAD .NET :: How To Use Block Properties Table Of Dynamic Block

It's about "Block Properties Table",I want to use a Block Properties Table to manage a Dynamic Block.

I  have defined a Dynamic Block a and its Block Properties Table in Autocad2010,this is the screenshot of the Block Properties Table(a1:d1=100,d2=200;a2:d1=100,d2=400;a3:d1=100,d2=600.) Now I want to insert the Dynamic Block using .NET API.after I input a command,the block of a2(d1=100,d2=400) is inserted. I have the code about it, but the code is not complete. this is the Dynamic Block

this is the  the screenshot of the Block Properties Table .

the result:

the code about it:

[CommandMethod("readBlockTable")]
static public void CmdReadBlockTable()
{
Editor ed = Application.DocumentManager.
MdiActiveDocument.Editor;
// select a block reference
[Code].......