best way to create custom excel report from multiple datatable or dataset in c#

try
            {
                SaveFileDialog saveDiag = new SaveFileDialog();
                saveDiag.Filter = " Excel (*.csv) | *.CSV | Fichier Text (*.txt)| *.txt";
                saveDiag.DefaultExt = "*.CSV";
                if (saveDiag.ShowDialog() == DialogResult.OK)
                {
                    using (Stream stream = File.Open(saveDiag.FileName, FileMode.Create,     
                           FileAccess.ReadWrite))
                    {
                        using (StreamWriter sWriter = new StreamWriter(stream, 
                               Encoding.UTF8))
                        {
                            //put your logic in here
                            sWriter.WriteLine("Name ; Last Name ; Login; Password ");
                            foreach(User user in ListUsers)
                            {
                                sWriter.WriteLine(user.Name + ";" + user.LastName + ";" +   
                                                  user.Password);    

                            }
                        }
                    }
                    MessageBox.Show("operation Completed");
                }
            }
            catch (Exception exception)
            {
                MessageBox.Show(exception.InnerException.ToString());
            }