How to write App.Config

[Jeff0803]

This code is just copied from MSDN, which is the sample code of Configuration Class.

// Define a custom section.
// The CustomSection type allows to define a custom section
// programmatically.
public sealed class CustomSection :
ConfigurationSection
{
// The collection (property bag) that contains
// the section properties.
private static ConfigurationPropertyCollection _Properties;

// Internal flag to disable
// property setting.
private static bool _ReadOnly;

// The FileName property.
private static readonly ConfigurationProperty _FileName =
new ConfigurationProperty("fileName",
typeof(string), "default.txt",
ConfigurationPropertyOptions.IsRequired);

// The MaxUsers property.
private static readonly ConfigurationProperty _MaxUsers =
new ConfigurationProperty("maxUsers",
typeof(long), (long)1000,
ConfigurationPropertyOptions.None);

// The MaxIdleTime property.
private static readonly ConfigurationProperty _MaxIdleTime =
new ConfigurationProperty("maxIdleTime",
typeof(TimeSpan), TimeSpan.FromMinutes(5),
ConfigurationPropertyOptions.IsRequired);

// CustomSection constructor.
public CustomSection()
{
// Property initialization
_Properties =
new ConfigurationPropertyCollection();

_Properties.Add(_FileName);
_Properties.Add(_MaxUsers);
_Properties.Add(_MaxIdleTime);
}


// This is a key customization.
// It returns the initialized property bag.
protected override ConfigurationPropertyCollection Properties
{
get
{
return _Properties;
}
}


private new bool IsReadOnly
{
get
{
return _ReadOnly;
}
}

// Use this to disable property setting.
private void ThrowIfReadOnly(string propertyName)
{
if (IsReadOnly)
throw new ConfigurationErrorsException(
"The property " + propertyName + " is read only.");
}


// Customizes the use of CustomSection
// by setting _ReadOnly to false.
// Remember you must use it along with ThrowIfReadOnly.
protected override object GetRuntimeObject()
{
// To enable property setting just assign true to
// the following flag.
_ReadOnly = true;
return base.GetRuntimeObject();
}


[StringValidator(InvalidCharacters = " ~!@#$%^&*()[]{}/;'\"|\\",
MinLength = 1, MaxLength = 60)]
public string FileName
{
get
{
return (string)this["fileName"];
}
set
{
// With this you disable the setting.
// Remember that the _ReadOnly flag must
// be set to true in the GetRuntimeObject.
ThrowIfReadOnly("FileName");
this["fileName"] = value;
}
}

[LongValidator(MinValue = 1, MaxValue = 1000000,
ExcludeRange = false)]
public long MaxUsers
{
get
{
return (long)this["maxUsers"];
}
set
{
this["maxUsers"] = value;
}
}

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


}


I want to write this to make App.Config.

1. How to write to App.Config?

2. How to write to other name(for example MyApp.Config)?

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