Default value in CongurationSection class property

Hi all,

I am writing my configuration class. My CustomSection class is derived
from ConfigurationSection. One of my setting is type of TimeSpan. I am
getting a problem to setup the DefaultValue.

The error message I got is " An attribute argument must be a constant
expression, typeof expression or array creation expression."

The problem is TimeSpan.FromMinutes (5) does not return an constant
expression. Anybody has an idea?

public sealed class CustomSection : ConfigurationSection
{

[ConfigurationProperty("maxIdleTime",IsRequired = false,
DefaultValue = TimeSpan.FromMinutes (5))]
[TimeSpanValidator(MinValueString = "0:0:30",
MaxValueString = "5:00:0",
ExcludeRange = false)]
public TimeSpan MaxIdleTime
{
get
{
return (TimeSpan)this["maxIdleTime"];
}
set
{
this["maxIdleTime"] = value;
}
}


}


Thanks in advance,

Davey

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