how to write button click event in Dynamic grid using bound field

DataTable dtdcDetails = new DataTable();
objRetailPL.sno = Convert.ToInt32(dtdate.Rows[i]["sno"].ToString());
dtdcDetails = objRetailBAL.dtdateTallyTable(objRetailPL);

GridView gv = new GridView();
//gv.ID = "gv" + dtdate.Rows[i]["BranchDate"].ToString();
gv.Width = 600;
Label lblTotal = new Label();
Label lbltotaleggs = new Label();

BoundField partyname = new BoundField();
partyname.HeaderText = "PartyName";
partyname.DataField = "partyname";
gv.Columns.Add(partyname);

BoundField birdtype = new BoundField();
birdtype.HeaderText = "Bird Type";
birdtype.DataField = "birdname";
gv.Columns.Add(birdtype);

BoundField totweight = new BoundField();
totweight.HeaderText = "Total Weight";
totweight.DataField = "totalweight";
gv.Columns.Add(totweight);

BoundField rateperkg = new BoundField();
rateperkg.HeaderText = "Rate/Kg";
rateperkg.DataField = "rateperkg";
gv.Columns.Add(rateperkg);


BoundField Bdcno = new BoundField();
Bdcno.HeaderText = "DCNo";
Bdcno.DataField = "dcno";
gv.Columns.Add(Bdcno);


ButtonField btn = new ButtonField();
//Initalize the DataField value.
btn.ItemStyle.HorizontalAlign = HorizontalAlign.Center;
btn.CommandName = "Button";
btn.ButtonType = ButtonType.Button;
btn.Text = "Confirm";
btn.Visible = true;
gv.Columns.Add(btn);



gv.AutoGenerateColumns = false;
gv.ShowFooter = true;
gv.DataSource = dtdcDetails;
gv.DataBind();