connection string problem in asp.net

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ASP.NET

SqlConnection conn = new SqlConnection("Data Source=TWS\\SQLEXPRESS;Initial Catalog=db_umesh;Integrated Security=SSPI;");

Is this a correct string or not?
i taken this from connectionstrings.com but
my fully code is here but its not showing values in gridview please help me
thanks

SqlConnection conn = new SqlConnection("Data Source=TWS\\SQLEXPRESS;Initial Catalog=db_umesh;Integrated Security=SSPI;");
string qry = "select * from tbl_course";
SqlCommand cmd = new SqlCommand(qry, conn);
try
{
  cmd.Connection.Open();
  gv1.DataSource = cmd.ExecuteReader();
  gv1.DataBind();
}
catch (Exception ex)
{
  lblmsg.Text = ex.ToString();
}
finally
{
  conn.Close();
}
}

Thanks and regards,
Umesh Daiya :)