CheckBoxList.RadioBoxList之类，如果初始化时某个ListItem设置为Selected=true，那么SelectedIndexChanged就会混乱。

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aspx:
<asp:RadioButtonList ID="radio_accountType" runat="server"
RepeatDirection="Horizontal"
AutoPostBack="true"
TabIndex="2" RepeatLayout="Table"
OnSelectedIndexChanged="radio_accountType_SelectedIndexChanged">
<asp:ListItem Text="���û�"
Value="1" Selected="true"></asp:ListItem>
<asp:ListItem Text="���û���"
Value="2"></asp:ListItem>
</asp:RadioButtonList>

c#:
protected void radio_accountType_SelectedIndexChanged(object sender,
EventArgs e)
{
switch (this.radio_accountType.SelectedValue)
{
case "1":
{
this.lbl_accountType.Text = "�û�";
this.combo_userGroup.Visible = true;
this.check_userList.Visible = true;
this.check_userGroupList.Visible = false;
break;
}
case "2":
{
this.lbl_accountType.Text = "�û���";
this.combo_userGroup.Visible = false;
this.check_userList.Visible = false;
this.check_userGroupList.Visible = true;
break;
}
}
}