Connection error when using SQLNCLI10 and a named instance

My webapp is using SQLNCLI10 to connect to a database and write data.

My connection string is as follows:

con.Open("provider=sqlncli10; server=(local); uid=sa; pwd=XXXX; database=X");

This works great.

But whenever I change the connection string to add my named instance:

con.Open("provider=sqlncli10; server=(local)\instanceName; uid=sa; pwd=XXXX; database=X");

I get the following error in my app:

TCP Provider: The requested name is valid, but no data of the requested type was found.

Does anyone have any clue what I can try?  

SQL Browser is running and the TCP/IP protocol is enabled.

Thanks!
LVL 6
hyphenpipeAsked:
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chaauCommented:
use server=localhost\instanceName instead
hyphenpipeAuthor Commented:
I received the same result:

TCP Provider: The requested name is valid, but no data of the requested type was found.

localhost by itself without the named instance works fine.
chaauCommented:
I just realised: is it C++ or C#? If it is then you need to escape the \ with the \\, or use the @ sign before the string literals (in C#). Read here

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hyphenpipeAuthor Commented:
This is classic ASP.
hyphenpipeAuthor Commented:
Right on the money.  Thanks!
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Microsoft SQL Server 2008

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