VB.NET - System.Data.SqlClient.SqlException: General network error. Check your

my erp solution working for many clients without problems.but some times  only i got error  like this System.Data.SqlClient.SqlException: General network error.  Check your network documentation.some times this occur 
after effect of loose network connection. i know it is related to sqlconnection open-close.if i close the application and open again,it will  work.i mean if iam connected in the network,and lose the nework connection suddenly,i will get  this error. how i can solve it immediately.please