can library compiled 1.0 be used in Application compiled in 2.0

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Baron Ng - 12 Apr 2006 10:00 GMT

I have an winform referencing another .net dll:
I would like to ask if the following works:
1. Library built in VS.Net 2002, and referenced in a WinForm created in
VS.Net 2005

2. Library built in VS.Net 2005, and referenced in a WinForm created in
VS.Net 2002

In case I have an application that is built on .Net 1.0
Can I force it to run on .Net 2.0?

Thanks!

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Mattias Sjögren - 12 Apr 2006 21:16 GMT

>I would like to ask if the following works:
>1. Library built in VS.Net 2002, and referenced in a WinForm created in
>VS.Net 2005

Yes

>2. Library built in VS.Net 2005, and referenced in a WinForm created in
>VS.Net 2002

>In case I have an application that is built on .Net 1.0
>Can I force it to run on .Net 2.0?

Sure, you can specify that in the config file.

Mattias

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Mattias Sjögren [C# MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
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Baron - 15 Apr 2006 03:43 GMT

Any compatibility issue if I
compile the winform in .net 2.0,
leave the referenced libraries compilied in .net 1.0
and use .Net 2.0 CLR to run everything?

if the library use .Net 1.0 version of System.Net
and the machine has both .Net 1.0 and .Net 2.0 installed

when the library referenced by .Net 2.0 winform
would it use .Net 1.0 or .Net 2.0 version of the System.Net???

Thanks~~

>>I would like to ask if the following works:
>>1. Library built in VS.Net 2002, and referenced in a WinForm created in
[quoted text clipped - 13 lines]
>
> Mattias

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Mattias Sjögren - 17 Apr 2006 18:44 GMT

>Any compatibility issue if I
>compile the winform in .net 2.0,
>
>leave the referenced libraries compilied in .net 1.0
>and use .Net 2.0 CLR to run everything?

Hopefully not, but there are some breaking changes documented here

http://msdn.microsoft.com/netframework/programming/breakingchanges/default.aspx

>if the library use .Net 1.0 version of System.Net
>and the machine has both .Net 1.0 and .Net 2.0 installed
>
>when the library referenced by .Net 2.0 winform
>would it use .Net 1.0 or .Net 2.0 version of the System.Net???

The version that comes with your loaded CLR version, i.e. 2.0.

Mattias

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Mattias Sjögren [C# MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
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Baron Ng - 18 Apr 2006 06:43 GMT

In that case;
the best option is to upgrade (and test) all the assemblies to .Net 2.0?
That's lot of works.....

since we can't just upgrade the 3rd party codes to .Net 2.0~~~~

Thanks anyway!

> >Any compatibility issue if I
> >compile the winform in .net 2.0,
[quoted text clipped - 15 lines]
>
> Mattias

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can library compiled 1.0 be used in Application compiled in 2.0

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