Multiple queries in a single code behind page

 using System;
using System.Data;
using System.Data.Sql;
using System.Data.SqlClient;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page 
{
    
    protected void Page_Load(object sender, EventArgs e)
    {
        Table tbl = myTable;

        SqlDataReader drGroups,Questions;

        using (SqlConnection dbConn = new SqlConnection(ConfigurationManager.ConnectionStrings["sqlcon"].ToString()))
        {
            SqlCommand cmd = new SqlCommand();
            cmd.Connection = dbConn;
            cmd.Connection.Open();

            cmd.CommandText = "Select * from GROUPS";
            drGroups = cmd.ExecuteReader();
            
            if (drGroups.HasRows)
            {
                while (drGroups.Read())
                {
                    TableRow tr = new TableRow();
                    tbl.Rows.Add(tr);
                    TableCell Group = new TableCell();
                    Group.Text = drGroups.GetValue(1).ToString();
                    Group.Width = Unit.Percentage(100);
                    tr.Controls.Add(Group);
                }
            }

        }
        
    }
}