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ConfigurationSettings.AppSettings is obsolete

Yet another .NET transition error: System.Configuration.ConfigurationSettings.AppSettings’ is obsolete: ‘This method is obsolete, it has been replaced by ConfigurationManager.AppSettings

Quick fix, change references of:

System.Configuration.ConfigurationSettings.AppSettings[AppKeyName].ToString();

to:

System.Configuration.ConfigurationManager.AppSettings[AppKeyName].ToString();