how to write the code in chechk_checkedchanged event when the check box is dynamically created

hi i created one check box dynamically and added to table like bellow

CheckBox chk=new CheckBox();

chk.AutoPostBack = true;

chk.CheckedChanged += new EventHandler(chk_CheckedChanged);

tbcell3.Controls.Add(chk);

tbrow1.Cells.Add(tbcell3);

tbl.Controls.Add(tbrow1);

this.Controls.Add(tbl);

like this the check box was created dynamically now i want to write the code in chk_checkedchanged event

how to write that, i tried like bellow but i didn't get result

void chk_CheckedChanged(object sender, EventArgs e)

{

tbl.BackColor = Color.Black;

}