Why do I recevie this error? Does the error lies in my code?

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C#

Error:
network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)

namespace ExportDataTableApplication
{
    class ExportDataTable
    {
        DateTime datetime = DateTime.Now;

        static void Main(string[] args) 
        {
            Console.WriteLine("Running App");

            DataSet ds = new DataSet();
            DateTime datetime = DateTime.Now;
            bool exception= false;

            string connString = string.Format("data source={0}; initial catalog={1}; Integrated Security ={2}; Connection Timeout={3}",
                       ConfigurationManager.AppSettings["DataSource"],
                       ConfigurationManager.AppSettings["InitialCatalog"],
                       ConfigurationManager.AppSettings["IntegratedSecurity"],
                       ConfigurationManager.AppSettings["TimeOut"]);

            using (SqlConnection conn = new SqlConnection(connString))
            {

                try //Call stored procedure
                {

                    SqlCommand sqlComm = new SqlCommand("dbo.Test", conn);

                    sqlComm.CommandType = CommandType.StoredProcedure;

                    SqlDataAdapter da = new SqlDataAdapter(sqlComm);

                    da.Fill(ds);
                }