Hello,

We are currently using a program where we recieve the details from the
client. Developed in C#.It is recieved through sockets.
It is working fine. i.e. When we start the program afresh we do get
details properly. We recieve the data as strings and we store in a list
box.But after two or three days we have an error stating as below


System.NullReferenceException: Object reference not set to an instance
of an object.
at System.Windows.Forms.ListBox.ItemArray.IndexOf(Obj ect item, Int32
stateMask)
at System.Windows.Forms.ListBox.ObjectCollection.AddI nternal(Object
item)
at System.Windows.Forms.ListBox.ObjectCollection.Add( Object item)
at StepIIServer.Server.RunClient2() in E:\stepII\Server.cs:line 346
8/7/2007 8:19:26 PM Error :$<MSG.Info.ServerLogin>
$DeviceName=352022000365427
$Software=steppII_2.4.3_final
$Hardware=STEPPII-55
$LastValidPosition=$GPRMC,145245.573,A,2941.6635,N
,07659.7630,E,0.00,2.34,070807,,
$IMEI=352022000365427
$PhoneNumber=
$LocalIP=555.36.20.147
$CmdVersion=2
$SUCCESS
$<end>
&IMEI=352022000365427,Distance=63936,
&GPRMC,145240.574,A,2941.6635,N,07659.7630,E,0.00,2 .34,070807,,
<end>

and another error stating
ping
System.Net.Sockets.SocketException: An existing connection was forcibly
closed by the remote host
at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32
size, SocketFlags socketFlags)
at System.Net.Sockets.Socket.Receive(Byte[] buffer)
at StepIIServer.Server.RunClient2() in E:\stepII\Server.cs:line 288
8/7/2007 5:51:34 AM Error :&IMEI=352022000370849,Distance=1487,
&GPRMC,001830.515,A,2943.0151,N,07658.9818,E,0.00,8 .79,070807,,
<end>

Will you please help

thanks
Hema


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cmrhema wrote:

> 
> Hello,
> 
> We are currently using a program where we recieve the details from the
> client. Developed in C#.It is recieved through sockets.
> It is working fine. i.e. When we start the program afresh we do get
> details properly. We recieve the data as strings and we store in a list
> box.But after two or three days we have an error stating as below


You didn't post any code, so the best anyone can do is guess.  My guess 
is this: you have a valid socket error (connection was reset, generating 
the one socket exception), which somehow results in you attempting to 
add a null string reference to your list box (generating the 
NullReferenceException).

Fix your socket error handling so that it catches the reset connection 
exception and doesn't try to add a null reference to the ListBox, and I 
would guess the NullReferenceException will go away.  You'll still get 
the SocketException, but since you'll be handling it, that's okay.

Pete