asp.net在table中动态添加一行包含(TextBox,Label）

TableRow tr = new TableRow();
for (int i = 0; i < this.Table1.Rows[0].Cells.Count; i++)
{
TableCell tc = new TableCell();
if (i == 0)
{
Label lb = new Label();
lb.ID = "lb" + this.Table1.Rows.Count.ToString();
lb.Text = this.Table1.Rows.Count.ToString();
tc.Controls.Add(lb);
}
if (i == 1)
{
TextBox tb = new TextBox();
tb.TextMode = TextBoxMode.MultiLine;
tb.ID = "tbAnswer" + this.Table1.Rows.Count.ToString();
tb.EnableViewState = true;
//tb.ViewStateMode = ViewStateMode.Inherit;//.Enabled;
//tb.AutoPostBack = true;