我正在使用2个链接按钮（协调员和工作人员），其中on_Click操作显示相应的面板，要求登录/注册/忘记密码。如果用户选择signup / forgotpassword，则弹出一个弹出窗口（使用ModalPopupExtender）询问信息。一切正常，除非我在面板中使用必需的字段验证器，当用户点击注册/忘记密码时弹出。如果我使用必填字段验证器我的页面运行正常，当我点击任何链接按钮（协调员/工作人员）时没有任何反应。 这是aspx代码：
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<style type = "text/css">
.modalBackground
{
background-color: gray;
}
.modalPopup
{
background-color: white;
border-width: 3px;
border-style: solid;
border-color: black;
padding-top: 10px;
padding-left: 10px;
width: 300px;
height: 140px;
}
.panel
{
background : gray;
padding : 10px;
}
div ul ul
{
display: none;
}
div ul li:hover > ul
{
display: block;
}
div ul li ul:hover > ul
{
display: block;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="Label1" runat="server" Font-Bold="True" Font-Names="Arial" Font-Size="XX-Large" Text="Automated Examination System"></asp:Label><br /> <br /><br />
<asp:Panel ID = "MainPanel" runat = "server" Height="181px" Width="275px">
<ul>
<li style="margin-left: 33px; width: 169px;"> <asp:LinkButton ID = "LinkAdmin" runat = "server" onclick="LinkAdmin_Click">Coordinator</asp:LinkButton></li>
<li style="width: 172px; margin-left: 33px"> <asp:LinkButton ID="LinkStaff" runat="server" onclick="LinkStaff_Click">Staff</asp:LinkButton></li>
<li style="margin-left: 33px"> <asp:LinkButton ID = "LinkStudent" runat = "server">Student</asp:LinkButton>
<ul>
<li><asp:LinkButton ID = "LinkButton1" runat = "server">Fresh Registration</asp:LinkButton></li>
<li><asp:LinkButton ID = "LinkButton2" runat = "server">Re Registration</asp:LinkButton></li>
</ul>
</li>
</ul>
</asp:Panel>
<asp:Panel ID="InfoPanel" runat="server" style="left: 290px; top: 104px; position: absolute; height: 375px; width: 611px"><br /><br /><br />
<asp:Label ID="Label2" runat="server" Font-Bold="False" Font-Names="Arial" Font-Size="Medium" Text="The Automated Examination system will allow post graduation student and under graduation students to register their respective courses for their respective semester. "></asp:Label>
<asp:Label ID="Label3" runat="server" Font-Bold="False" Font-Names="Arial" Font-Size="Medium" Text="Once the registration process is completed for a student the system sends information to the controller of examination."></asp:Label><br />
<asp:Label ID="Label4" runat="server" Font-Bold="False" Font-Names="Arial" Font-Size="Medium" Text="Each staff will be able to enter the CIE1 and CIE2 marks based on the privileges provided by coordinator of that respective department. "></asp:Label><br />
<asp:Label ID="Label5" runat="server" Font-Bold="False" Font-Names="Arial" Font-Size="Medium" Text="Once the staff enters marks for CIE1/CIE2, they won’t be allowed to make changes later on. "></asp:Label><br />
<asp:Label ID="Label6" runat="server" Font-Bold="False" Font-Names="Arial" Font-Size="Medium" Text="After submitting the marks, the staff will be given with print out of the entered marks for further reference. "></asp:Label><br />
<asp:Label ID="Label7" runat="server" Font-Bold="False" Font-Italic="False" Font-Names="Arial" Font-Size="Medium" Text="At the end of a semester each student SGPA is calculated and the controller take a back up copy of grade cards and result sheet of all the students. "></asp:Label><br />
<asp:Label ID="Label9" runat="server" Font-Bold="False" Font-Names="Arial" Font-Size="Medium" Text="Since student grades are sensitive information certain measures are taken to prevent unauthorized access. "></asp:Label><br />
<asp:Label ID="Label8" runat="server" Font-Bold="False" Font-Names="Arial" Font-Size="Medium" Text="The system also generate the transcript of student which contains all semester marks, Course Title in that particular semester, SGPA of each semester and overall CGPA of that student. "></asp:Label>
</asp:Panel>
<asp:Panel ID="AdminLogin" runat="server" style= "left: 906px; top: 105px; position: absolute; " Visible="False" Width="430px"><br/>
<asp:Label ID="Label10" runat="server" Text="Coordinator Login"></asp:Label><br /><br />
<asp:Label ID="Label11" runat="server" Text="Select Department : "></asp:Label>
<asp:DropDownList ID="DropDownList1" runat="server" ValidationGroup="AdminLogin"></asp:DropDownList>
<asp:RequiredFieldValidator ID="AdminReq1" runat="server" ControlToValidate="DropDownList1" ErrorMessage="Department is blank" ForeColor="Red" ValidationGroup="AdminLogin"></asp:RequiredFieldValidator><br /><br />
<asp:Label ID="Label12" runat="server" Text="Select Branch : "></asp:Label>
<asp:DropDownList ID="DropDownList2" runat="server" ValidationGroup="AdminLogin"></asp:DropDownList>
<asp:RequiredFieldValidator ID="AdminReq2" runat="server" ControlToValidate="DropDownList2" ErrorMessage="Branch is blank" ForeColor="Red" ValidationGroup="AdminLogin"></asp:RequiredFieldValidator><br /><br />
<asp:Label ID="Label13" runat="server" Text="Username : "></asp:Label>
<asp:TextBox ID="AdminTxt1" runat="server" ValidationGroup="AdminLogin" style="height: 22px"></asp:TextBox>
<asp:RequiredFieldValidator ID="AdminReq3" runat="server" ControlToValidate="AdminTxt1" ErrorMessage="Username is blank" ForeColor="Red" ValidationGroup="AdminLogin"></asp:RequiredFieldValidator><br /><br />
<asp:Label ID="Label14" runat="server" Text="Password : "></asp:Label>
<asp:TextBox ID="AdminTxt2" runat="server" TextMode="Password" ValidationGroup="AdminLogin"></asp:TextBox>
<asp:RequiredFieldValidator ID="AdminReq4" runat="server" ControlToValidate="AdminTxt2" ErrorMessage="Password is blank" ForeColor="Red" ValidationGroup="AdminLogin"></asp:RequiredFieldValidator><br /><br />
<asp:Button ID="AdminLog" runat="server" Text="Login" Width="80px" ValidationGroup="AdminLogin" />
<asp:Button ID="AdminSignUp" runat="server" Text="New Coordinator" Width="110px"/>
<asp:Button ID="AdminForPwd" runat="server" Text="Forgot Password" />
</asp:Panel>
<asp:Panel ID="StaffLogin" runat="server" style="left: 906px; top: 105px; position: absolute;" Visible="False" Width="430px"><br />
<asp:Label ID="Label15" runat="server" Text="Staff Login"></asp:Label><br /><br />
<asp:Label ID="Label16" runat="server" Text="Username : "></asp:Label>
<asp:TextBox ID="StaffTxt1" runat="server" Width="127px" ValidationGroup="StaffLogin"></asp:TextBox>
<asp:RequiredFieldValidator ID="StaffReq1" runat="server" ControlToValidate=" StaffTxt1" ErrorMessage="Username is blank" ForeColor="Red" ValidationGroup="StaffLogin"></asp:RequiredFieldValidator><br /><br />
<asp:Label ID="Label17" runat="server" Text="Password : "></asp:Label>
<asp:TextBox ID="StaffTxt2" runat="server" TextMode="Password" ValidationGroup="StaffLogin"></asp:TextBox>
<asp:RequiredFieldValidator ID="StaffReq2" runat="server" ControlToValidate=" StaffTxt2" ErrorMessage="Password is blank" ForeColor="Red" ValidationGroup="StaffLogin"></asp:RequiredFieldValidator><br /><br />
<asp:Button ID="StaffLog" runat="server" Text="Login" Width="80px" ValidationGroup="StaffLogin" />
<asp:Button ID="StaffSignUp" runat="server" Text="New Staff" Width="82px"/>
<asp:Button ID="StaffForPwd" runat="server" Text="Forgot Password" Width="110px" />
</asp:Panel>
<asp:Panel ID="StaffSP" CssClass="modalPopup" style="display: none" runat="server">
<asp:Label ID="Label18" runat="server" Text="Staff Sign Up" Font-Size="XX-Large"></asp:Label><br /><br />
<asp:Label ID="Label19" runat="server" Text="Enter Course Code : "></asp:Label>
<asp:TextBox ID="StaffSPTxt1" runat="server"></asp:TextBox>
<asp:RequiredFieldValidator ID="StaffSPReq1" runat="server" ErrorMessage="Course Code is BLANK" ForeColor="Red" ControlToValidate="StaffSPTxt1"></asp:RequiredFieldValidator><br /><br />
<asp:Label ID="Label20" runat="server" Text="Enter Password : "></asp:Label>
<asp:TextBox ID="StaffSPTxt2" runat="server" TextMode="Password"></asp:TextBox>
<asp:RequiredFieldValidator ID="StaffSPReq2" runat="server" ErrorMessage="Password is BLANK" ForeColor="Red" ControlToValidate="StaffSPTxt2"></asp:RequiredFieldValidator><br /><br />
<asp:Label ID="Label21" runat="server" Text="Retype Password : "></asp:Label>
<asp:TextBox ID="StaffSPTxt3" runat="server" TextMode="Password"></asp:TextBox>
<asp:CompareValidator ID="StaffSPCom1" runat="server" ErrorMessage="Password Mismatch" ForeColor="Red" ControlToCompare="StaffSPTxt2" ControlToValidate="StaffSPTxt3"></asp:CompareValidator><br /><br />
<asp:Label ID="Label22" runat="server" Text="Enter Password Hint : "></asp:Label>
<asp:TextBox ID="StaffSPTxt4" runat="server" TextMode="Password"></asp:TextBox>
<asp:RequiredFieldValidator ID="StaffSPReq3" runat="server" ErrorMessage="Password Hint is BLANK" ForeColor="Red" ControlToValidate="StaffSPTxt4"></asp:RequiredFieldValidator><br /><br />
<asp:Button ID="Button3" runat="server" Text="Sign Up" />
<asp:Button ID="Button4" runat="server" Text="Cancel" />
</asp:Panel>
<asp:Panel ID="StaffFP" CssClass="modalPopup" style="display: none" runat="server">
<asp:Label ID="Label23" runat="server" Text="Staff Forgot Password" Font-Size="XX-Large"></asp:Label><br /><br />
<asp:Label ID="Label24" runat="server" Text="Enter Username : "></asp:Label>
<asp:TextBox ID="StaffFPTxt1" runat="server"></asp:TextBox>
<asp:RequiredFieldValidator ID="StaffFPReq1" runat="server" ErrorMessage="Username is BLANK" ForeColor="Red" ControlToValidate="StaffFPTxt1"></asp:RequiredFieldValidator><br /><br />
<asp:Label ID="Label25" runat="server" Text="Enter Password Hint : "></asp:Label>
<asp:TextBox ID="StaffFPTxt2" runat="server" TextMode="Password"></asp:TextBox>
<asp:RequiredFieldValidator ID="StaffFPReq2" runat="server" ErrorMessage="Hint is BLANK" ForeColor="Red" ControlToValidate="StaffFPTxt2"></asp:RequiredFieldValidator><br /><br />
<asp:Button ID="Button5" runat="server" Text="GetPassword" />
<asp:Button ID="Button6" runat="server" Text="Cancel" />
</asp:Panel>
<asp:Panel ID="AdminSP" CssClass="modalPopup" style="display: none" runat="server">
<asp:Label ID="Label26" runat="server" Text="Coordinator Sign Up" Font-Size="XX-Large"></asp:Label><br /><br />
<asp:Label ID="Label27" runat="server" Text="Select Department : "></asp:Label>
<asp:DropDownList ID="AdminSPDrp1" runat="server" ></asp:DropDownList>
<asp:RequiredFieldValidator ID="AdminSPReq1" runat="server" ErrorMessage="Department is BLANK" ForeColor="Red" ControlToValidate="AdminSPDrp1"></asp:RequiredFieldValidator><br /><br />
<asp:Label ID="Label28" runat="server" Text="Select Branch : "></asp:Label>
<asp:DropDownList ID="AdminSPDrp2" runat="server" ></asp:DropDownList>
<asp:RequiredFieldValidator ID="AdminSPReq2" runat="server" ErrorMessage="Branch is BLANK" ForeColor="Red" ControlToValidate="AdminSPDrp2"></asp:RequiredFieldValidator><br /><br />
<asp:Label ID="Label29" runat="server" Text="Enter Username : "></asp:Label>
<asp:TextBox ID="AdminSPTxt1" runat="server"></asp:TextBox>
<asp:RequiredFieldValidator ID="AdminSPReq3" runat="server" ErrorMessage="Username is BLANK" ForeColor="Red" ControlToValidate="AdminSPTxt1"></asp:RequiredFieldValidator><br /><br />
<asp:Label ID="Label30" runat="server" Text="Enter Password : "></asp:Label>
<asp:TextBox ID="AdminSPTxt2" runat="server" TextMode="Password"></asp:TextBox>
<asp:RequiredFieldValidator ID="AdminSPReq4" runat="server" ErrorMessage="Password is BLANK" ForeColor="Red" ControlToValidate="AdminSPTxt2"></asp:RequiredFieldValidator><br /><br />
<asp:Label ID="Label31" runat="server" Text="Retype Password : "></asp:Label>
<asp:TextBox ID="AdminSPTxt3" runat="server" TextMode="Password"></asp:TextBox>
<asp:CompareValidator ID="AdminSPCom1" runat="server" ControlToValidate = "AdminSPTxt3" ControlToCompare = "AdminSPTxt2" ErrorMessage="Password Mismatch" ForeColor="Red"></asp:CompareValidator><br /><br />
<asp:Label ID="Label32" runat="server" Text="Enter Password Hint : "></asp:Label>
<asp:TextBox ID="AdminSPTxt4" runat="server" TextMode="Password"></asp:TextBox>
<asp:RequiredFieldValidator ID="AdminSPReq5" runat="server" ErrorMessage="Hint is BLANK" ForeColor="Red" ControlToValidate="AdminSPTxt4"></asp:RequiredFieldValidator><br /><br />
<asp:Button ID="Button7" runat="server" Text="Sign Up" />
<asp:Button ID="Button8" runat="server" Text="Cancel" />
</asp:Panel>
<asp:Panel ID="AdminFP" CssClass="modalPopup" style="display: none" runat="server">
<asp:Label ID="Label33" runat="server" Text="Coordinator Forgot Password" Font-Size="XX-Large"></asp:Label><br /><br />
<asp:Label ID="Label34" runat="server" Text="Select Department : "></asp:Label>
<asp:DropDownList ID="AdminFPDrp1" runat="server" ></asp:DropDownList>
<asp:RequiredFieldValidator ID="AdminFPReq1" runat="server" ErrorMessage="Department is BLANK" ForeColor="Red" ControlToValidate="AdminFPDrp1"></asp:RequiredFieldValidator><br /><br />
<asp:Label ID="Label35" runat="server" Text="Select Branch : "></asp:Label>
<asp:DropDownList ID="AdminFPDrp2" runat="server" ></asp:DropDownList>
<asp:RequiredFieldValidator ID="AdminFPReq2" runat="server" ErrorMessage="Branch is BLANK" ForeColor="Red" ControlToValidate="AdminFPDrp2"></asp:RequiredFieldValidator><br /><br />
<asp:Label ID="Label36" runat="server" Text="Enter Username : "></asp:Label>
<asp:TextBox ID="AdminFPTxt1" runat="server"></asp:TextBox>
<asp:RequiredFieldValidator ID="AdminFPReq3" runat="server" ErrorMessage="Username is BLANK" ForeColor="Red" ControlToValidate="AdminFPTxt1"></asp:RequiredFieldValidator><br /><br />
<asp:Label ID="Label37" runat="server" Text="Enter Password Hint : "></asp:Label>
<asp:TextBox ID="AdminFPTxt2" runat="server" TextMode="Password"></asp:TextBox>
<asp:RequiredFieldValidator ID="AdminFPReq4" runat="server" ErrorMessage="Hint is BLANK" ForeColor="Red" ControlToValidate="AdminFPTxt2"></asp:RequiredFieldValidator><br /><br />
<asp:Button ID="Button9" runat="server" Text="Sign Up" />
<asp:Button ID="Button10" runat="server" Text="Cancel" />
</asp:Panel>
<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
<asp:ModalPopupExtender ID="ModalPopupExtender1" BackgroundCssClass="modalBackground" PopupControlID = "StaffSP" CancelControlID = "Button4" TargetControlID = "StaffSignUp" runat="server"></asp:ModalPopupExtender>
<asp:ModalPopupExtender ID="ModalPopupExtender2" BackgroundCssClass="modalBackground" PopupControlID = "StaffFP" CancelControlID = "Button6" TargetControlID = "StaffForPwd" runat="server"></asp:ModalPopupExtender>
<asp:ModalPopupExtender ID="ModalPopupExtender3" BackgroundCssClass="modalBackground" PopupControlID = "AdminSP" CancelControlID = "Button8" TargetControlID = "AdminSignUp" runat="server"></asp:ModalPopupExtender>
<asp:ModalPopupExtender ID="ModalPopupExtender4" BackgroundCssClass="modalBackground" PopupControlID = "AdminFP" CancelControlID = "Button10" TargetControlID = "AdminForPwd" runat="server"></asp:ModalPopupExtender>
</div>
</form>
</body>
</html>
这是页面背后的代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class MasterFinal : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void LinkAdmin_Click(object sender, EventArgs e)
{
AdminLogin.Visible = true;
StaffLogin.Visible = false;
}
protected void LinkStaff_Click(object sender, EventArgs e)
{
AdminLogin.Visible = false;
StaffLogin.Visible = true;
}
}