Webservice problem

I have some issues calling webservices. I have a server running on a wireless network that hosts the webservice im trying to access. This webservice has 3 simple methods that return string arrays and a dataset.

My problem is that everyonce in a while the webservice stops responding and the pocket application justs gets stuck, sometimes it will achieve 10 calls sucessfully on a row, and sometimes in the first call it fails.

Any ideas why is this happening, or what am I missing? I tried to add a timer, wait for 10 seconds to get the response and then abort the call, however it didnt work that well.

the code is quite simple:

VinosWeb.VinosWeb dataaccess =new VinosWeb.VinosWeb();
int[]lista =this.dataaccess.getPais(param);

and the webservice getPais call:

[WebMethod]

publicint[] getPais(int t)

{

SqlConnection con =new SqlConnection("workstation id=localhost;packet size=4096;integrated security=SSPI;data source=localhost;persist security info=False;initial catalog=Vino");

String s = "SELECT DISTINCT Pais FROM Vino WHERE Tipo = '"+t+"';";
SqlDataAdapter da =new SqlDataAdapter(s,con);
DataSet ds =new DataSet();
da.Fill(ds);
int[] lista =newint[ds.Tables[0].Rows.Count];
for(int i = 0; i < ds.Tables[0].Rows.Count; i++)
{
lista[i ] =int.Parse(ds.Tables[0].Rows[i ]["Pais"].ToString());
}
return lista;

}

[2453 byte] By [Albino] at [2007-12-16]