  {
 //get the value
object oValue = GetValue( eKey );
//value not found or null?
if (null == oValue)
 {
//return default value
return oDefaultValue;
 }
//everything oke: return session value
return oValue;
}
#endregion
private: GetMandatoryValue( eKeys eKey )#region private: GetMandatoryValue( eKeys eKey )
/**//// <summary>
/// Returns the session value for a session-key that must exist.
/// If the key does not exist an applicationException is thrown.
/// </summary>
/// <param name="eKey"> The session-key to return the session-value for. </param>
/// <returns> A none-null value.</returns>
private static object GetMandatoryValue( eKeys eKey )
{
//get the value
object oValue = GetValue( eKey );
//key not found or value null?
if ( null == oValue )
{
//throw applicationException because its application logic error (none CLR)
throw new ApplicationException ( String.Format( sMANDATORY_SESSION_KEY_NOT_FOUND_MSG, eKey.ToString() ));
}
//everything oke: return value
return oValue;
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