Why does C# host application change long double precision of C++ dll?

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<div style="margin-right:65px Hello all,<br/>
<br/>
I developed dll in Intel C++ that applies long double arithmetic operations. <br/>
My dll allocates 128 bit for each long double variable and performs 19 digits precision operations if I use C++ or Delphi host application.
<br/>
In case of C# host application the dll allocates 128 bit also but number of significant digits is reduced to 15 (same with double).
<br/>
How does it possible and what do I have to do to increase a number of significant digits to 19?<br/>
<br/>
Thanks.

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