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Which mean I want to call function in delphi VCL/ DLL to retrieve information. Is this possible?

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Yes, if the dll is not .Net you will need to use Platform Invoke [DllImport] calls.

Have a look here for windows API examples here (http://pinvoke.net/) which should help you call your delphi dlls.

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And it also depends on the types you are exporting. Make sure they are not Delphi specific types (no string, no TStringList, etc).
Instead of PInvoke you could also make a COM/ActiveX library in Delphi which then can be called from C# using interop.
@Lars This comment is worthy of being an answer
@David: As fas as I know creating COM/ActiveX libraries requires registration of the library, which may cause additional issues depending on the situation. Sometimes its just easier to access the existing dll driectly without the additional layer.
@Mark I'm not advocating one over the other. I'm just saying that both are worthy of consideration. The corresponding downside of P/invoke is that it can be quite hard to get right.
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