ASP.Net(Dynamic Controls(runtime controls with event handler) )

protected void Page_Load(object sender, EventArgs e)

    {

        for (int i = 0; i < 4; i++)

        {

            HtmlGenericControl divControl = new HtmlGenericControl("DIV");

            divControl.Style.Add("float", "left");

            divControl.Style.Add("clear", "both");

            TextBox tb = new TextBox();

            tb.ID = "txtTextBox" + (i + 1).ToString();

            divControl.Controls.Add(tb);

            tb = new TextBox();

            tb.ID = "txtValue" + (i + 1).ToString();

            divControl.Controls.Add(tb);

            Button btn = new Button();

            btn.Text = "Click Me";

            btn.CommandArgument = "tb_" + (i + 1).ToString();

            btn.Click += new EventHandler(btn_Click);

            divControl.Controls.Add(btn);

            divControls.Controls.Add(divControl);

        }

    }

    void btn_Click(object sender, EventArgs e)

    {

        string tboxName = "txtTextBox" + (sender as Button).CommandArgument.ToString().Substring(3, 1);

        TextBox tbox = (TextBox)this.FindControl(tboxName);

        Response.Write(tbox.Text);

        tboxName = "txtValue" + (sender as Button).CommandArgument.ToString().Substring(3, 1);

        tbox = (TextBox)this.FindControl(tboxName);

        Response.Write(tbox.Text);

    }