overriding exception message

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I wanted to create an exception handler for certain processing I do - but
although I can 'throw' to the constructor with a parameter, I cannot
override the exception message property, the error says its read only. How
can or if a person can create the override ?

class privateException: Exception
{
public privateException(string str)
{
Console.WriteLine("User Defined Exception" +
this.Message+this.StackTrace);
// this.Message=" Special Error " + str
// you cannot seem to create modify the message.
// this input could cause some additional interaction - maybe here
// would be where a file could be written
}
public privateException()
{

}
}
--
Andrew
.

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