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What is the content of your .config file? In particular what is the full contents of the line<br />
&lt;add key =&quot;en-gb&quot; .....&gt;
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What is the content of your .config file? In particular what is the full contents of the line
<add key ="en-gb" .....>

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&lt;add key=&quot;TestCulture&quot; value=&quot;en-gb&quot;/&gt;
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It is<br />
<br />
&lt;add key=&quot;DefaultCulture&quot; value=&quot;en-gb&quot;/&gt;
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It is

<add key="DefaultCulture" value="en-gb"/>

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<div class="content wysiwyg-content">
<br />
CultureInfo DefaultCulture = new CultureInfo(&quot;en-gb&quot;);<br />
DefaultCulture = new CultureInfo(System.Configu<wbr />ration.Con<wbr />figuration<wbr />Manager.Ap<wbr />pSettings[<wbr />&quot;en-gb&quot;]);<wbr /><br />
<br />
String reference not set to an instance of a string<br />
Parameter name :name
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CultureInfo DefaultCulture = new CultureInfo("en-gb");
DefaultCulture = new CultureInfo(System.Configuration.ConfigurationManager.AppSettings["en-gb"]);

String reference not set to an instance of a string
Parameter name :name

string reference not set to an instance of a string

C# is an object-oriented programming language created in conjunction with Microsoft’s .NET framework. Compilation is usually done into the Microsoft Intermediate Language (MSIL), which is then JIT-compiled to native code (and cached) during execution in the Common Language Runtime (CLR).