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[DllImport("comdlg32.dll", CharSet = CharSet.Auto, EntryPoint = "ChooseFont", SetLastError=true)]

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public extern static bool ChooseFont(IntPtr lpcf);

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Declare Function ChooseFont Lib "comdlg32.dll" (TODO) As TODO

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public struct CHOOSEFONT

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public enum CHOOSEFONTFLAGS

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CHOOSEFONT choosefont = new CHOOSEFONT();

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choosefont.lStructSize = Marshal.SizeOf(choosefont);

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choosefont.nSizeMin = 64;

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choosefont.nSizeMax = 64;

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choosefont.Flags = (int)CHOOSEFONTFLAGS.CF_SCREENFONTS

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     | (int)CHOOSEFONTFLAGS.CF_FORCEFONTEXIST

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     | (int)CHOOSEFONTFLAGS.CF_INACTIVEFONTS

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     | (int)CHOOSEFONTFLAGS.CF_INITTOLOGFONTSTRUCT

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     | (int)CHOOSEFONTFLAGS.CF_SCALABLEONLY

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     | (int)CHOOSEFONTFLAGS.CF_USESTYLE;

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choosefont.lpLogFont = pLogfont;

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IntPtr pChoosefont = Marshal.AllocHGlobal(Marshal.SizeOf(choosefont));

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Marshal.StructureToPtr(choosefont, pChoosefont, false);

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bool result = ChooseFont(pChoosefont);

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Marshal.FreeHGlobal(pChoosefont);

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Documentation

[ChooseFont] on MSDN