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You need to add a reference to the System.Configuration.dll to your project.
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You need to add a reference to the System.Configuration.dll to your project.

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Oh, sorry I forgot to mention I did that. &nbsp;What's strange is that I don't see it listed anywhere in the solution explorer. &nbsp;In fact, I don't see the &quot;refrerences&quot; folder anywhere, so after I right-click on the project and add the reference, I can't tell if it's been added or not. &nbsp;Guess not.
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Oh, sorry I forgot to mention I did that.  What's strange is that I don't see it listed anywhere in the solution explorer.  In fact, I don't see the "refrerences" folder anywhere, so after I right-click on the project and add the reference, I can't tell if it's been added or not.  Guess not.

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I am going to assume that ConfigurationMangager is a typo, right? &nbsp;Is this a web site or a web application (.csproj file)?
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I am going to assume that ConfigurationMangager is a typo, right?  Is this a web site or a web application (.csproj file)?

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ConfigurationManager is the 2.0 and 3.5 way, and that is the 1.1 way, so let's not go there, OK?
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ConfigurationManager is the 2.0 and 3.5 way, and that is the 1.1 way, so let's not go there, OK?

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What happens with a new temporary test web site?
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What happens with a new temporary test web site?

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<div class="content wysiwyg-content">
Experts,<br />
<br />
I have a web app in C# that has always worked, but now when I run it I get an error on this line:<br />
<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; using (SqlConnection gdbConnection = new SqlConnection(Configuratio<wbr />nManager.C<wbr />onnectionS<wbr />trings[con<wbr />nectionStr<wbr />ingName].C<wbr />onnectionS<wbr />tring))<br />
<br />
It says that the &quot;ConfigurationMangager&quot; object doesn't exist. &nbsp;I thought that class was part of the framework, but it's acting like I need to instantiate it myself. &nbsp;What am I missing?
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</div>


Experts,

I have a web app in C# that has always worked, but now when I run it I get an error on this line:

          using (SqlConnection gdbConnection = new SqlConnection(ConfigurationManager.ConnectionStrings[connectionStringName].ConnectionString))

It says that the "ConfigurationMangager" object doesn't exist.  I thought that class was part of the framework, but it's acting like I need to instantiate it myself.  What am I missing?

Missing Configuration Manager

The .NET Framework is not specific to any one programming language; rather, it includes a library of functions that allows developers to rapidly build applications. Several supported languages include C#, VB.NET, C++ or ASP.NET.