[2005] Button click event is not fired. why?

[senthilkumartd]

I am inheriting Gridview to add a functionality to add a record in the gridview. I bind the gridview with the sqldatasource. Assume that the category table has two fields "code" & "name"

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;


namespace GridUpControl
{
    public class GridCustomControl : GridView, INamingContainer
    {
        public Button btn = new Button();
        public TextBox txtbx = new TextBox();



        public void ShowAddButton()
        {
            btn.Text = "Add";
            btn.Click += new EventHandler(btn_Click);

            //Controls.Add(btn);

        }

        public void btn_Click(object sender,EventArgs e)
        {
           
            SqlConnection conn = new SqlConnection(ConnectionString);
            SqlCommand cmd = new SqlCommand(InsertText, conn);
            conn.Open();
            cmd.ExecuteNonQuery();
            conn.Close();
            this.DataBind();
        }

        public GridCustomControl() : base() 
		{


		}

        [Bindable(true)]
        [Category("Appearance")]
        [DefaultValue("")]
        [Localizable(true)]
        public string InsertText
        {
            get
            {
                //EnsureChildControls();
                String s = (String)ViewState["InsertText"];
                return ((s == null) ? String.Empty : s);
            }

            set
            {
                //EnsureChildControls();
                ViewState["InsertText"] = value;
            }
        }

        public string ConnectionString
        {
            get
            {
               //EnsureChildControls();
                String s = (String)ViewState["ConnectionString"];
                return ((s == null) ? String.Empty : s);
            }

            set
            {
               // EnsureChildControls();
                ViewState["ConnectionString"] = value;
            }
        }
     
        protected override void Render(HtmlTextWriter writer)
        {
            base.Render(writer);
            btn.RenderControl(writer);
        }
    }
}

Utilizing Code in default.aspx:

protected void Page_Load(object sender, EventArgs e)
    {
        GridCustomControl1.ShowFooter = true;
        GridCustomControl1.ConnectionString = ConfigurationManager.ConnectionStrings["TraineeDBConnectionString"].ConnectionString;

        TextBox CatName = (TextBox)GridCustomControl1.FooterRow.FindControl("CategoryNameTextBox");
        GridCustomControl1.InsertText = "insert into ec_category(name) values('" + CatName.Text + "')";
        GridCustomControl1.ShowAddButton();

    }

Now, the button click event is not fired. It remains ideal. Please help. I don't know the above code is optimum or not. Please help.