Formatting AutoGenerateColumns in an ASP.NET Grid

using System;
using System.Data;
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;

/// <summary>
/// Summary description for DataProvider
/// </summary>
public class DataProvider
{

    // Create the sample datasource for these exercises
    // this simulates a stored procedure that returns variable value columns
    public static DataTable CreateDataSource(int numValueColumns)
    {
        DataTable t = new DataTable();

        // create the table structure
        DataColumn c = new DataColumn();

        c = new DataColumn();
        c.DataType = System.Type.GetType("System.String");
        c.ColumnName = "Category";
        t.Columns.Add(c);

        for (int i = 1; i <= numValueColumns; i++)
        {
            c = new DataColumn();
            c.DataType = System.Type.GetType("System.Int32");
            c.ColumnName = "Value" + i.ToString();
            t.Columns.Add(c);
        }

        // populate the table with some sample rows of data
        Random rnd = new Random();
        DataRow r = t.NewRow();
        r["Category"] = "North Region";
        for (int i = 1; i <= numValueColumns; i++) r["Value" + i.ToString()] = rnd.Next(10, 10000);
        t.Rows.Add(r);

        r = t.NewRow();
        r["Category"] = "South Region";
        for (int i = 1; i <= numValueColumns; i++) r["Value" + i.ToString()] = rnd.Next(10, 10000);
        t.Rows.Add(r);

        r = t.NewRow();
        r["Category"] = "East Region";
        for (int i = 1; i <= numValueColumns; i++) r["Value" + i.ToString()] = rnd.Next(10, 10000);
        t.Rows.Add(r);

        r = t.NewRow();
        r["Category"] = "West Region";
        for (int i = 1; i <= numValueColumns; i++) r["Value" + i.ToString()] = rnd.Next(10, 10000);
        t.Rows.Add(r);

        return t;
    }

}