GridView CheckBox

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ASP.NET

Dear All,
I have been trying to figure out bellow but I really dont know what I am missing. I am trying to place an event for GridView CheckBox CheckedChanged event in RowDataBound, but it it doesent work.
bellow is the code for RowDataBound of a GridView

protected void gv_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            CheckBox c = (CheckBox)e.Row.Cells[0].Controls[0];
            c.Enabled = true;
            c.ID = e.Row.Cells[2].Text;
            c.ToolTip = e.Row.Cells[1].Text;
            c.AutoPostBack = true;
            c.CheckedChanged += chk_CheckedChanged;
        }
    }
    protected void chk_CheckedChanged(object sender, EventArgs e)
    {
        CheckBox cc = sender as CheckBox;
        Response.Write(cc.Checked.ToString());
    }

when I do Check or UnCheck the GridView CheckBox nothing happens.
any idea where my code goes wrong.