[2005] Web custom control - calling Button Event?

[senthilkumartd]

I am creating a custom control by inheriting the Gridview
In the "rendercontents" method, I gave like below,

        protected void btn_Click()
        {
            SqlConnection conn = new SqlConnection(ConnectionString);
            SqlCommand cmd = new SqlCommand(InsertText, conn);
            conn.Open();
            cmd.ExecuteNonQuery();
            conn.Close();
            this.DataBind();
            this.ShowAddButton();
        }

protected override void RenderContents(HtmlTextWriter output)
        {
                base.RenderContents(output);

                StringBuilder sb = new StringBuilder();
                sb.Append("<asp:Button ID='btn' runat='server' Text='Addnew' onClick=btn_Click/>");
                
               output.Write(sb.ToString());

        }

Issues:
1. It won't display the button in the output screen
2. If I use <input type=Button value ='add' onClick='btn_click'> (html button) instead of asp.net servercontrol, in the above coding, it won't call the btn_click, which reside in the custom control's one of the procedure.

How to solve the above problem? help needed