Test for network connection

[Rich]

I aplogize for posting on a topic which I'm sure has already been
discussed here, but I have searched the archives and not found a
solution that works quite like I was hoping.

I'm developing a Compact Framework application which needs to work in
both "connected" and "disconnected" modes. The user has an option to
synchronize the locally saved data with the master SQL database when
necessary, and I would like to test for an active network connection
prior to doing so. I have expirmented with the WebRequest class and it
works, but it seems especially slow to return an HttpStatusCode.

It just seems that there should be a simpler, quicker way to get this
status. Does anyone have any suggestions or advice?

Thanks in advance.

 

[Sergey Bogdanov]

Here is a code snippet:

static public bool IsConnected
{
get
{
bool ret;
try
{
string HostName = Dns.GetHostName();
IPHostEntry thisHost = Dns.GetHostByName(HostName);
string thisIpAddr = thisHost.AddressList[0].ToString();

ret = thisIpAddr != IPAddress.Parse("127.0.0.1").ToString();
}
catch
{
return false;
}

return ret;
}
}


Best regards,
Sergey Bogdanov
http://www.sergeybogdanov.com

 

[mgarner1980]

here's a link as well

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnnetcomp/html/networkcomponent.asp

 

[Rich]

This technique seems to work well for detecting whether an active
connection has been lost. However, I'm having problems using this
technique on a device which has just been booted up and no connection
is available. The code just hangs for several seconds and an exception
is eventually thrown. Any ideas?

Thanks.

Here is a code snippet:

static public bool IsConnected
{
get
{
bool ret;
try
{
string HostName = Dns.GetHostName();
IPHostEntry thisHost = Dns.GetHostByName(HostName);
string thisIpAddr = thisHost.AddressList[0].ToString();

ret = thisIpAddr != IPAddress.Parse("127.0.0.1").ToString();
}
catch
{
return false;
}

return ret;
}
}


Best regards,
Sergey Bogdanov
http://www.sergeybogdanov.com

I aplogize for posting on a topic which I'm sure has already been
discussed here, but I have searched the archives and not found a
solution that works quite like I was hoping.

I'm developing a Compact Framework application which needs to work in
both "connected" and "disconnected" modes. The user has an option to
synchronize the locally saved data with the master SQL database when
necessary, and I would like to test for an active network connection
prior to doing so. I have expirmented with the WebRequest class and it
works, but it seems especially slow to return an HttpStatusCode.

It just seems that there should be a simpler, quicker way to get this
status. Does anyone have any suggestions or advice?

Thanks in advance.

 

[Sergey Bogdanov]

If exception was thrown then IsConnected returns false. That is why the
main part of the property included into try ... catch block.

Best regards,
Sergey Bogdanov
http://www.sergeybogdanov.com

This technique seems to work well for detecting whether an active
connection has been lost. However, I'm having problems using this
technique on a device which has just been booted up and no connection
is available. The code just hangs for several seconds and an exception
is eventually thrown. Any ideas?

Thanks.

Here is a code snippet:

static public bool IsConnected
{
get
{
bool ret;
try
{
string HostName = Dns.GetHostName();
IPHostEntry thisHost = Dns.GetHostByName(HostName);
string thisIpAddr = thisHost.AddressList[0].ToString();

ret = thisIpAddr != IPAddress.Parse("127.0.0.1").ToString();
}
catch
{
return false;
}

return ret;
}
}


Best regards,
Sergey Bogdanov
http://www.sergeybogdanov.com

I aplogize for posting on a topic which I'm sure has already been
discussed here, but I have searched the archives and not found a
solution that works quite like I was hoping.

I'm developing a Compact Framework application which needs to work

in

both "connected" and "disconnected" modes. The user has an option

to

synchronize the locally saved data with the master SQL database

when

necessary, and I would like to test for an active network

connection

prior to doing so. I have expirmented with the WebRequest class

and it

this