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How to get Appsettings Value From the Web.Config File ?

try
{
string strAlertThreshold = ConfigurationManager.AppSettings["AlertThreshold"].ToString();
m_iAlertThreshold = Convert.ToInt32(strAlertThreshold);
return true;
}
catch (Exception objException)
{
m_iAlertThreshold = 0;
throw new Exception(objException.Message.ToString());
}

return false;

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