string reference not set to an instance of a string

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
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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" .....>
PradeepYadhavAuthor Commented:
<add key="TestCulture" value="en-gb"/>
PradeepYadhavAuthor Commented:
It is

<add key="DefaultCulture" value="en-gb"/>
Ah, in which case try:
DefaultCulture = new CultureInfo(System.Configuration.ConfigurationManager.AppSettings["TestCulture"]);

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i agree to agbrown.
but you should not make this call:
DefaultCulture = new CultureInfo(System.Configuration.ConfigurationManager.AppSettings["TestCulture"]);

you should evaluate your constructor arguments before using them:

CultureInfo DefaultCulture = null;
string testValue = System.Configuration.ConfigurationManager.AppSettings["TestCulture"];
if(testValue != null)
  DefaultCulture = new CultureInfo(testValue);
 //handle the uninitialized cultureinfo

regards, vo1d
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