Calling a function in a .pbd from C#

Does anyone have any code samples or a web site that will show me how to call into a .pbd file to execute a function? The function works from PB, but now I need to call it from C# also.

I tried this code:

[DllImport("C:\\Program Files\\PBBase\\update1.pbd", EntryPoint = "run_update")]
static extern bool run_update(bool b1, bool b2, bool b3, bool b4, bool b5, bool b6, bool b7);

public void CallPBUpdate()

but am getting this error:
An attempt was made to load a program with an incorrect format. (Exception from HRESULT: 0x8007000B)

C# 2.0
PB 10.0
Win XP


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Hi clu82, I'm afraid it's not so easy ...
take a look to this article :

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If you have source code you can compile powerbuilder application in machine code (.dll) instead of (.pbd) and try to call the same function from dll.

I am not sure just guessing....

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