asp.net - XML Parsing Error, running .NET 3.5 application in VS 2013 -

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i took on dormant asp.net web forms project. project uses ms sql server end -- enterprise edition, v10.50 (i think that's 2008); development environment vm of ms server 2008 r2 hosting both visual studio , ms sql server.

the first thing tried run project. error page with:

xml parsing error: no element found

location: http://localhost:{port}/{page}.aspx

line number 1, column 1:

and html source blank.

on test system, project has been deployed.

i've looked through similar questions , google results. typical problem unclosed tag in web.config -- checked that, , tags closed. else might causing problem?

i think problem in sql server connection. connection string is:

<add name="foo" connectionstring="data source=.\sqlserver2008r2;initial catalog=foobar;integrated security=true" providername="system.data.sqlclient" />

update: opened server explorer , attempted expand database. got error: "could not load file or assembly 'microsoft.sqlserver.managment.sdk.sfc'. issue discussed in this question, , i'll try solution that.

update 2: didn't change anything, once cleared component model cache.

update 3: sql connection string not problem. put in plain html test file, , got same problem. presently issue appears related project targeting .net 3.5 platform. have updated question title.


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