I have C# application which manage SQL database. Database is on SQLEXPRESS server.
The problem is when i try to connect from another computer in network it does not work.

The error is : A network related or instance-specific error....
The SQL The server is set to receive connections.

The connection sting is : public string strConnSring = "Data Source=192.168.1.15\\SQLEXPRESS; database=data; Integrated Security=SSPI";

What can be wrong?