execute sql quries by asp.net c#

SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["constring"].ConnectionString);
public void create()
{
 if (con.State == ConnectionState.Closed)
  {
     con.Open();
  }          

 cmd = new SqlCommand("create table tbl_table(id int Identity(1,1) primary key, newtext varchar(100) )", con);
cmd.ExecuteNonQuery();
 if (con.State == ConnectionState.Open)
  {
     con.Close();
  }
}