Create dynamic GridView

using System;
using System.Web.UI;
using System.Web.UI.WebControls;

public class TemplateHandler : ITemplate
{
    void ITemplate.InstantiateIn(Control container)
    {
        Button  cmd= new Button();
        cmd.ID = "cmd";
        cmd.Text = "HI";
        cmd.Click += new EventHandler(Dynamic_Method);
        container.Controls.Add(cmd);
    }

    protected void Dynamic_Method(object sender, EventArgs e)
    {
        ((Button)sender).Text = "Hellooooo";
    }
}

protected void Page_Load(object sender, EventArgs e)
    {
        DataTable dt = new DataTable();

        dt.Columns.Add("FirstName");
        dt.Columns.Add("LastName");
        dt.Columns.Add("Age", typeof(System.Int32));

        DataRow oItem = dt.NewRow();
        oItem[0] = "Shawpnendu";
        oItem[1] = "Bikash";
        oItem[2] = 32;
        dt.Rows.Add(oItem);

        oItem = dt.NewRow();
        oItem[0] = "Bimalendu";
        oItem[1] = "Bikash";
        oItem[2] = 27;
        dt.Rows.Add(oItem);

        GridView gv = new GridView();
        gv.AutoGenerateColumns = false;

        BoundField nameColumn = new BoundField();
        nameColumn.DataField = "FirstName";
        nameColumn.HeaderText = "First Name";
        gv.Columns.Add(nameColumn);

        nameColumn = new BoundField();
        nameColumn.DataField = "LastName";
        nameColumn.HeaderText = "Last Name";
        gv.Columns.Add(nameColumn);

        nameColumn = new BoundField();
        nameColumn.DataField = "Age";
        nameColumn.HeaderText = "Age";
        gv.Columns.Add(nameColumn);

        // Here is template column portion
        TemplateField TmpCol = new TemplateField();
        TmpCol.HeaderText = "Click Me";
        gv.Columns.Add(TmpCol);
        TmpCol.ItemTemplate = new TemplateHandler();        

        gv.DataSource = dt;
        gv.DataBind();

        Form.Controls.Add(gv);
    }