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我有一个名为lbxUpcommingEvents的ListBox。当索引改变时，事件处理程序被触发以检查重复记录。如果没有找到重复项，则通过显示样式的方式打开一个名为pnlAction的面板。如果发现嘟嘟声，另一面板pnlActionCancel打开并且oter关闭。基本上是toogle效果。面板可见性开/关切换效果不起作用
我试过了可视属性，viewstate属性，但它不起作用，我再也找不到它了，我从集体中寻找wizdom。这是我的代码。
protected void lbxUpcommingEvents_OnSelectedIndexChanged(object sender, EventArgs e)
{
pnlEventsSignUp.Visible = true;
string _selectedItemValue = lbxUpcommingEvents.SelectedValue.ToString();
int _eventid = Convert.ToInt32(_selectedItemValue);
Guid _memberId = Guid.Empty;
_memberId = new Guid(Session["myId"].ToString());
// Check for existing signup
EventsMemberSignup _createSingup = new EventsMemberSignup();
dsEventsSingupTableAdapters.MemberEventsTableAdapter da = new dsEventsSingupTableAdapters.MemberEventsTableAdapter();
dsEventsSingup.MemberEventsDataTable dt = da.GetDataForDupCheck(_memberId, _eventid);
if (dt.Rows.Count == 1)
{
Panel pnlAction = (Panel)(fvEventSignUp.FindControl("pnlAction"));
//pnlAction.Visible = false;
pnlAction.Style.Add("display","none");
Panel pnlActionCancel = (Panel)(fvEventSignUp.FindControl("pnlActionCancel"));
//pnlActionCancel.Visible = true;
pnlActionCancel.Style.Remove("display");
}
else
{
Panel pnlActionCancel = (Panel)(fvEventSignUp.FindControl("pnlActionCancel"));
//pnlActionCancel.Visible = false;
pnlActionCancel.Style.Add("display", "none");
Panel pnlAction = (Panel)(fvEventSignUp.FindControl("pnlAction"));
//pnlAction.Visible = true;
pnlAction.Style.Remove("display");
}
}
<div id="columnleft">
<a name="content_start" id="content_start"></a>
<div class="leftblock">
<h2>Events Signup</h2>
<p>
</p>
<h3> Upcomming Events</h3>
<p>
<asp:ListBox ID="lbxUpcommingEvents" runat="server" DataSourceID="odsUpcommingEvents"
Rows="6" DataTextField="Title" DataValueField="id" AutoPostBack="true"
Width="206px" OnSelectedIndexChanged="lbxUpcommingEvents_OnSelectedIndexChanged" />
</p>
<h3> Members Attending</h3>
<p>
<asp:DataGrid ID="lboxSignedUpMembers" runat="server" DataSourceID="odsSignedUpMembers"
AutoPostBack="true" AutoGenerateColumns="false" RowStyle-CssClass="gridview" AlternatingRowStyle-CssClass="altbgcolor"
Width="206px" onselectedindexchanged="lboxSignedUpMembers_SelectedIndexChanged" CssClass="gridview"
GridLines="None" BorderStyle="Solid" BorderWidth="1" BorderColor="Black" >
<AlternatingItemStyle BackColor="White" />
<Columns>
<asp:BoundColumn DataField="Name" />
<asp:BoundColumn DataField="Title" />
<asp:TemplateColumn >
<ItemTemplate>
<asp:Label runat="server" ID="lblDate" Text='<%# Eval("StartTime", "{0:d}") %>' />
</ItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:DataGrid>
</p>
</div>
</div>
</td>
<td align="left" >
<!--Start of right column-->
<div id="columnright">
<div class="rightblock">
<asp:Panel ID="pnlEventsSignUpTitle" runat="server" CssClass="actionbuttons">
<h2>Select an Event to Signup</h2>
</asp:Panel>
<asp:Label runat="server" ID="lblNote" ForeColor="#cc0000" Font-Bold="true" />
</div>
<div class="rightblock">
<asp:Panel runat="server" ID="pnlEventsSignUp" visible="false">
<div class="dashedline" ></div>
<asp:FormView ID="fvEventSignUp" runat="server" DataSourceID="ObjectDataSource1"
DataKeyNames="id" Width="100%" >
<ItemTemplate>
<h2>
<asp:HiddenField runat="server" ID="hfEventID" Value='<%# Eval("id") %>' />
<asp:Label Text='<%# Eval("title") %>' runat="server" ID="titleLabel" />
</h2>
<div class="itemdetails">
<br />
location:
<h3>
<asp:Label ID="locationLabel" runat="server" Text='<%# ShowLocationLink(Eval("locationname"),Eval("location")) %>' />
</h3>
<p>
<asp:Label Text='<%# Eval("starttime","{0:D}") %>' runat="server" ID="itemdateLabel" CssClass="GeneralText" />
<asp:Label Text='<%# ShowDuration(Eval("starttime"),Eval("endtime")) %>' runat="server" ID="Label1" CssClass="GeneralText" />
</p>
</div>
<div class="downloadevent">
<a href="#">
<img src="images/icon_download_event.gif" alt="Download this event to your personal calendar"
width="15" height="26" /></a><a href='<%# "events_download.ashx?EventID=" + Convert.ToString(Eval("id")) %>'>Add
this event to your personal calendar</a>
</div>
<Club:ImageThumbnail ID="thumb1" runat="server" ImageSize="Large" PhotoID='<%# Eval("photo") %>' />
<p>
<asp:Label Text='<%# Eval("description") %>' runat="server" ID="descriptionLabel" />
</p>
<div class="dashedline" ></div>
<asp:Panel ID="pnlAction" runat="server" CssClass="actionbuttons" >
<table border="0" cellpadding="2" cellspacing="2">
<tr>
<td>
<asp:Label runat="server" ID="Label2" Text="Action<br />Required" Width="80px" Font-Bold="true"
ForeColor="#cc0000" Font-Size="14px" />
</td>
<td>
<img src="images/RedArrow.jpg" alt="Red Arrow Right" />
</td>
<td>
<asp:CheckBox runat="server" ID="cbxCert" Height="30px" Text="Check to Confirm Attendance" /><br />
<asp:CustomValidator runat="server" ID="rfvConfirm"
ErrorMessage="You must check the box to continue" Font-Bold="true"
ForeColor="#cc0000" ClientValidationFunction="ensureChecked" /> <br />
<Club:RolloverLink ID="rlnkSignUp" runat="server" Text = "I will be attending this event"
OnClick="rlnkSignUp_OnClick" ToolTip="I hereby certify that I am commiting to attending this event."
/>
</td>
</tr>
</table>
</asp:Panel>
<asp:Panel runat="server" ID="pnlActionCancel" CssClass="actionbuttons" >
<table border="0" cellpadding="2" cellspacing="2">
<tr>
<td>
<asp:Label runat="server" ID="lblDupSignup" Text="You are alredy signed up for this event" ForeColor="#cc0000" Font-Bold="true" Font-Size="14px" />
</td>
<td>
</td>
<td>
<asp:CheckBox runat="server" ID="cbxCancel" Height="30px" Text="Check to Cancel Attendance" /><br />
<asp:CustomValidator runat="server" ID="CustomValidator1"
ErrorMessage="You must check the box to continue" Font-Bold="true"
ForeColor="#cc0000" ClientValidationFunction="ensureChecked" /> <br />
<Club:RolloverLink ID="rlnCancel" runat="server" Text="I'm cancelling my participation"
OnClick="rlnCancel_OnClick" />
</td>
</tr>
</table>
</asp:Panel>
</ItemTemplate>
</asp:FormView>
</asp:Panel>
</div>