DataSet离线数据集

            using (SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=StudentDB;User ID=sa;Password=123456"))
            {
                conn.Open();
                using (SqlCommand cmd = conn.CreateCommand())
                {
                    cmd.CommandText = "select * from T_student where Name=@Name";
                    cmd.Parameters.Add(new SqlParameter("@Name", txtName.Text));
                    //SqlDataAdapter是一个帮我们把SqlCommand查询结果填充到DataSet中的类
                    SqlDataAdapter adapter = new SqlDataAdapter(cmd);
                    //DataSet相当于本地的一个复杂集合(List<int>)
                    DataSet dataset = new DataSet();
                    //把SqlCommand查询结果填充到DataSet中
                    adapter.Fill(dataset);
                    DataTable table = dataset.Tables[0];
                    DataRowCollection rows = table.Rows;
                    for (int i = 0; i < rows.Count; i++)
                    {
                        DataRow row = rows[i];
                        string name = (string)row["Name"];
                        decimal score = (decimal)row["Score"];
                        MessageBox.Show(name+","+score.ToString());
                    }

                }
            }