C#

public class MyClass {
  private const string SettingKey = "SomeSettingKey";
  private static readonly System.String SettingValue = 
        System.Configuration.ConfigurationManager.AppSettings[SettingKey];
}

public class MyClass {
  private readonly System.String SettingValue;  // readonly if it never changes during the "life" of this instance
  public MyClass() {
         const string SettingKey = "SomeSettingKey";
         this.SettingValue = System.Configuration.ConfigurationManager.AppSettings[SettingKey];
  }
}

Jasmine2501 wrote:

wouldn't that take a memory location we don't need to use?

class Test
{
  static void Main() {
    object a = "hello";
    object b = "hello";
    System.Console.WriteLine(a == b);
  }
}

Orjan Westin wrote:

a ConfigurationErrorsException will be thrown if the value is not found