Stack Overflow Sql 2005 Clr

Please help.
I have a sql 2005 table-value function coded in .net. I'm getting a horrible stack overflow exception with the following call :

select * from dbo.clr_DecodeTime(-15809);

The code is here :

public partial class UserDefinedFunctions

{

[SqlFunction(TableDefinition= "ArrTime nvarchar(4), DepTime nvarchar(4)",FillRowMethodName="ProcessesFillRowTime")]

public static IEnumerable clr_DecodeTime(int EncodedTime)

{

List<Airports> airport = new List<Airports>();

Airports a = new Airports();

a.ArrTime = "1000";

a.DepTime = "1100";

airport.Add(a);

return airport;

}

public static void ProcessesFillRowTime(Object o, out SqlChars arrTime, out SqlChars depTime)

{

Airports airport = o as Airports;

arrTime = new SqlChars(airport.ArrTime);

depTime = new SqlChars(airport.DepTime);

}

};

catch (Exception Ex)

{

throw new Exception(Ex.Message);

}

public class Airports

{

private string arrcode;

public string ArrCode

{

get

{

return arrcode;

}

set

{

arrcode = value;

}

}

private string depcode;

public string DepCode

{

get

{

return depcode;

}

set

{

depcode = value;

}

}

private string depdate;

public string DepDate

{

get

{

return DepDate;

}

set

{

DepDate = value;

}

}

private string arrdate;

public string ArrDate

{

get

{

return ArrDate;

}

set

{

ArrDate = value;

}

}



private string arrtime;

public string ArrTime

{

get

{

return ArrTime;

}

set

{

ArrTime = value;

}

}



private string deptime;

public string DepTime

{

get

{

return DepTime;

}

set

{

DepTime = value;

}

}

}

}
The message I get back is :

Msg 6538, Level 16, State 49, Line 1

.NET Framework execution was aborted because of stack overflow.
Every time I try and debug the function my pc hang. ps I'm using vista business edition and vs 2005.