但是,当我把button_click相同的代码块在页面加载事件db_SelectedIndexChanged执行。protected void Button1_Click(object sender, EventArgs e)
{
TableRow tb = new TableRow();
TableCell tc=new TableCell();
DropDownList db = new DropDownList();
db.Items.Add("Bangalore");
db.Items.Add("Mandya");
db.Items.Add( "Hassan");
tc.Controls.Add(db);
tb.Controls.Add(tc);
Table1.Controls.Add(tb);
db.SelectedIndexChanged += db_SelectedIndexChanged;
db.AutoPostBack = true;
}
private void db_SelectedIndexChanged(object sender,EventArgs e)
{
label.text="welcome";
}
但是,当我在按钮点击db_SelectedIndexChanged使用代码不执行。
这背后的原因可能是什么?