Double is treated as a float in C #

Question

I have a strange problem in C # on visual studio 2013 (.NET framework 4.0):

When I compile running the following code from the main thread:

//========== double ddd = 300000.0; ddd *= ddd; Console.Write("The result is: " + ddd); //========== 

As a result, I get: "Result: 89999998976"

When I run the same code from another thread in the same executable, I get:

"Result: 90000000000"

It seems that the double in the main stream is considered as a float (32 bit precision instead of 64 bit precision).

Does anyone know why this is happening?

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EDIT:

I have found the answer. I am using Managed DirectX. Apparently, you need to point to the creation of a directX device so as not to bother with FPU precision (CreateFlags.FpuPreserve), otherwise the doubles will be treated as floating.

For more information: floating point precision