asp:checkbox always sends false - asp.net

Question

I have the following issue, i want to disable or enable a control in my asp form by using asp:checkbox but when i click on the checkbox to change the checked state to true or false, it will always send "false"
<%# Page Language="VB" MasterPageFile="~/Site.master" AutoEventWireup="false" CodeFile="Registration.aspx.vb" Inherits="Default2" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
<style type="text/css">
.auto-style2 {
text-align: left;
}
.auto-style3 {
font-family: "Times New Roman", Times, serif;
}
.auto-style4 {
font-family: "Times New Roman", Times, serif;
font-size: medium;
}
.auto-style5 {
font-family: "Times New Roman", Times, serif;
font-weight: bold;
font-size: x-large;
}
.auto-style6 {
font-size: medium;
}
.auto-style7 {
font-family: "Times New Roman", Times, serif;
font-size: x-large;
text-transform: capitalize;
border-style: outset;
border-width: 3px;
}
.auto-style8 {
width: 351px;
}
.auto-style9 {
width: 344px;
}
</style>
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<div id="registration" class="auto-style2">
<asp:Label ID="lblMessage" runat="server" Text=""></asp:Label>
<br />
<table>
<tr>
<td>Employees in the database:</td>
<td>
<asp:UpdatePanel ID="upddlEmployee" runat="server">
<ContentTemplate>
<asp:DropDownList
ID="drpEmployee"
runat="server"
Height="30px"
Width="175px"
BackColor="White"
CssClass="auto-style2"
ForeColor="#000099"
AutoPostBack="true">
</asp:DropDownList>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID ="drpEmployee" EventName="SelectedIndexChanged" />
</Triggers>
</asp:UpdatePanel>
</td>
</tr>
</table>
<br />
<br />
<table>
<tr>
<td class="auto-style8">
<asp:Label ID="Label1" runat="server" Text="Employee ID:*" Width="300px"
Font-Bold="True" CssClass="auto-style7" Height="31px" BorderStyle="None"></asp:Label>
</td>
<td class="auto-style9">
<asp:UpdatePanel ID="UpdatePanel5" runat="server">
<ContentTemplate>
<asp:TextBox ID="txtEmployee_id" runat="server" CssClass="auto-style5" Height="30px" Width="200px" AutoPostBack ="true" OnTextChanged ="txtEmployeeUser_id_TextChanged"></asp:TextBox>
</ContentTemplate>
</asp:UpdatePanel>
</td>
<td>
<asp:UpdatePanel ID="UpdatePanel7" runat="server">
<ContentTemplate>
<span class="auto-style6">
<asp:label
ID="lblEmployeeID"
runat="server"
Text =""
InitialValue="" Width="229px"></asp:label>
</span>
</ContentTemplate>
</asp:UpdatePanel>
</td>
</tr>
<tr>
<td class="auto-style8"><span class="auto-style6">
<asp:Label ID="Label4" runat="server" Text="First Name:*" Width="300px"
Font-Bold="True" CssClass="auto-style7" height="30px" BorderStyle="None"></asp:Label>
</span>
</td>
<td class="auto-style9">
<asp:TextBox ID="txtFirstName" runat="server" Width="200px" CssClass="auto-style5" height="30px"></asp:TextBox>
</td>
<td>
<span class="auto-style6">
<asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server"
ControlToValidate="txtFirstName" ErrorMessage="First Name Required" CssClass="auto-style3" Width="300px"></asp:RequiredFieldValidator>
</span>
</td>
</tr>
<tr>
<td class="auto-style8">
<span class="auto-style6">
<asp:Label ID="Label5" runat="server" Text=" Last Name:*" Width="300px"
Font-Bold="True" CssClass="auto-style7" height="30px" BorderStyle="None"></asp:Label>
</span>
</td>
<td class="auto-style9">
<asp:TextBox ID="txtLastName" runat="server" Width="200px" CssClass="auto-style5" height="30px"></asp:TextBox>
</td>
<td>
<span class="auto-style6">
<asp:RequiredFieldValidator ID="RequiredFieldValidator4" runat="server"
ControlToValidate="txtLastName" ErrorMessage="Last Name Required" CssClass="auto-style3" Width="300px"></asp:RequiredFieldValidator>
</span>
</td>
</tr>
<tr>
<td class="auto-style8">
<span class="auto-style6">
<asp:Label ID="lblUsername" runat="server" Text=" User Name:*" Width="300px"
Font-Bold="True" CssClass="auto-style7" height="30px" BorderStyle="None"></asp:Label>
</span></td>
<td class="auto-style9">
<asp:UpdatePanel ID="UpdatePanel6" runat="server">
<ContentTemplate>
<asp:TextBox ID="txtUserName" runat="server" CssClass="auto-style5" height="30px" Width="200px" AutoPostBack ="True" OnTextChanged="txtEmployeeUser_id_TextChanged"></asp:TextBox>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="txtUserName" EventName="TextChanged" />
</Triggers>
</asp:UpdatePanel>
</td>
<td>
<span class="auto-style6">
<asp:label
ID="lblUsernameCheck"
runat="server"
Text =""
InitialValue="" Width="229px"></asp:label>
</span>
</td>
</tr>
<tr>
<td class="auto-style8">
<span class="auto-style6">
<asp:Label ID="Label6" runat="server" Text="Regular Time:" Width="300px"
Font-Bold="True" CssClass="auto-style7" height="30px" BorderStyle="None"></asp:Label>
</span>
</td>
<td class="auto-style9">
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:TextBox ID="txtRegularTime" runat="server" CssClass="auto-style5" height="30px" TextMode="Number" Width="200px" AutoPostBack ="True" OnTextChanged ="txtRegularTime_TextChanged"></asp:TextBox>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="txtRegularTime" EventName="TextChanged" />
</Triggers>
</asp:UpdatePanel>
</td>
<td> </td>
</tr>
<tr>
<td class="auto-style8">
<span class="auto-style6">
<asp:Label ID="Label7" runat="server" Text="Double Time:" Width="300px"
Font-Bold="True" CssClass="auto-style7" height="30px" BorderStyle="None"></asp:Label>
</span>
</td>
<td class="auto-style9">
<asp:UpdatePanel ID="UpdatePanel2" runat="server">
<ContentTemplate>
<asp:TextBox ID="txtDoubleTime" runat="server" CssClass="auto-style5" height="30px" TextMode="Number" Width="200px"></asp:TextBox>
</ContentTemplate>
</asp:UpdatePanel>
</td>
<td> </td>
</tr>
<tr>
<td class="auto-style8">
<span class="auto-style6">
<asp:Label ID="Label8" runat="server" Text="Part Time:" Width="300px"
Font-Bold="True" CssClass="auto-style7" height="30px" BorderStyle="None"></asp:Label>
</span>
</td>
<td class="auto-style9">
<asp:UpdatePanel ID="UpdatePanel3" runat="server">
<ContentTemplate>
<asp:TextBox ID="txtPartTime" runat="server" Width="200px" TextMode="Number" CssClass="auto-style5" height="30px" AutoPostBack ="True" OnTextChanged ="txtPartTime_TextChanged"></asp:TextBox>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="txtPartTime" EventName="TextChanged" />
</Triggers>
</asp:UpdatePanel>
</td>
<td> </td>
</tr>
<tr>
<td class="auto-style8">
<span class="auto-style6">
<asp:Label ID="Label9" runat="server" Text="Over time:" Width="300px"
Font-Bold="True" CssClass="auto-style7" height="30px" BorderStyle="None"></asp:Label>
</span>
</td>
<td class="auto-style9">
<asp:UpdatePanel ID="UpdatePanel4" runat="server">
<ContentTemplate>
<asp:TextBox ID="txtOverTime" runat="server" Width="200px" TextMode="Number" CssClass="auto-style5" height="30px"></asp:TextBox>
</ContentTemplate>
</asp:UpdatePanel>
</td>
<td> </td>
</tr>
<tr>
<td class="auto-style8">
<asp:Label ID="Label2" runat="server" Text=" Password:*" Width="231px" Font-Bold="True" CssClass="auto-style7" height="30px" BorderStyle="None"></asp:Label>
<asp:UpdatePanel ID="UpdatePanel8" runat="server">
<ContentTemplate>
<asp:CheckBox ID="CheckBox1" runat="server" AutoPostBack="true" OnCheckedChanged="chkChecked" />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger EventName="CheckedChanged" ControlID ="CheckBox1" />
</Triggers>
</asp:UpdatePanel>
</td>
<td class="auto-style9">
<asp:UpdatePanel ID="UpdatePanel9" runat="server">
<ContentTemplate>
<asp:TextBox ID="txtPassword" runat="server" Width="200px" TextMode="Password" CssClass="auto-style5" height="30px"></asp:TextBox>
</ContentTemplate>
</asp:UpdatePanel>
</td>
<td>
<span class="auto-style6">
<asp:CustomValidator ID="txtpasswordValidator" runat="server"
ControlToValidate="txtPassword" ErrorMessage="Password Required" CssClass="auto-style3" Width="300px"
OnServerValidate="txtpassword_ServerValidate" >
</asp:CustomValidator>
</span></td>
</tr>
<tr>
<td class="auto-style8">
<span class="auto-style6">
<asp:Label ID="Label3" runat="server" Text=" Confirm Password:*" Width="300px"
Font-Bold="True" CssClass="auto-style7" height="30px" BorderStyle="None"></asp:Label>
</span>
</td>
<td class="auto-style9">
<asp:UpdatePanel ID="UpdatePanel10" runat="server">
<ContentTemplate>
<asp:TextBox ID="txtConfirmpassword" runat="server" Width="200px" TextMode="Password" CssClass="auto-style5" height="30px"></asp:TextBox>
</ContentTemplate>
</asp:UpdatePanel>
</td>
<td>
<span class="auto-style6">
<asp:CustomValidator
ID="CustomValidator1"
runat="server"
ControlToValidate="txtConfirmpassword"
ErrorMessage="Password mismatch"
OnServerValidate="txtConfirmpassword_ServerValidate"
CssClass="auto-style3"
Width="300px"></asp:CustomValidator>
</span></td>
</tr>
<tr>
<td class="auto-style8">
<asp:Label ID="Label10" runat="server" Text="Label" Visible="False"></asp:Label>
</td>
<td class="auto-style9"> </td>
<td> </td>
</tr>
<tr>
<td class="auto-style8"> </td>
<td class="auto-style9"> </td>
<td> </td>
</tr>
</table>
<br />
<span class="auto-style6">
<br class="auto-style3" />
</span><span class="auto-style4"> </span><span class="auto-style6">
<br class="auto-style3" />
<Table runat="server" >
<tr>
<td>
<asp:Button
ID="btnConfirmPassword"
runat="server"
Text="Confirm Registration"
onclick="Button1_Click"
Font-Bold="True"
Font-Size="X-Large"
Height="50px"
Width="250px" />
</td>
<td>
<asp:Button
ID="btnClear"
runat="server"
Text="ClearData"
onclick="btnClear_Click"
Font-Bold="True"
Font-Size="X-Large"
Height="50px"
Width="250px" />
</td>
</tr>
</Table>
</span>
</div>
</asp:Content>
and the code that is invoqued by the asp is the following:
Imports System.Data
Imports System.Configuration
Imports MySql.Data.MySqlClient
Partial Class Default2
Inherits System.Web.UI.Page
Dim gclass As New GlobalClass
Dim employeeData As New Employee
Dim intEmployee() As Integer
Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles btnConfirmPassword.Click
If drpEmployee.SelectedIndex = -1 Then
ExeQuery("I")
Else
ExeQuery("U")
End If
clearFields()
End Sub
Sub ExeQuery(strMode As String)
If txtRegularTime.Text <> "" Then
Dim query As String = gclass.SPEmployeeCall(strMode, 1, txtUserName.Text, txtPassword.Text, txtConfirmpassword.Text, _
txtEmployee_id.Text, txtFirstName.Text, txtLastName.Text, _
Convert.ToDouble(txtOverTime.Text), Convert.ToDouble(txtDoubleTime.Text), _
Convert.ToDouble(txtPartTime.Text), Convert.ToDouble(txtRegularTime.Text))
gclass.ExecuteSP(query)
End If
End Sub
Protected Sub txtRegularTime_TextChanged(sender As Object, e As EventArgs) Handles txtRegularTime.TextChanged
If Convert.ToDecimal(txtRegularTime.Text) > 0 Then
txtDoubleTime.Text = Convert.ToDecimal(txtRegularTime.Text * 2)
txtOverTime.Text = Convert.ToDecimal(txtRegularTime.Text * 1.5)
txtPartTime.Text = 0
End If
txtPassword.Focus()
End Sub
Protected Sub txtPartTime_TextChanged(sender As Object, e As EventArgs) Handles txtPartTime.TextChanged
If Convert.ToDecimal(txtPartTime.Text) > 0 Then
txtDoubleTime.Text = 0
txtOverTime.Text = 0
txtRegularTime.Text = 0
End If
txtPassword.Focus()
End Sub
Sub clearFields()
drpEmployee.SelectedIndex = 0
checkboxDRPemployee()
txtEmployee_id.Text = Nothing
txtFirstName.Text = Nothing
txtLastName.Text = Nothing
txtUserName.Text = Nothing
txtDoubleTime.Text = Nothing
txtOverTime.Text = Nothing
txtRegularTime.Text = Nothing
txtPartTime.Text = Nothing
End Sub
Sub clearFields(dt As DataTable)
txtEmployee_id.Text = dt.Rows(0)(1)
txtFirstName.Text = dt.Rows(0)(2)
txtLastName.Text = dt.Rows(0)(3)
txtUserName.Text = dt.Rows(0)(8)
txtDoubleTime.Text = dt.Rows(0)(5)
txtOverTime.Text = dt.Rows(0)(4)
txtRegularTime.Text = dt.Rows(0)(7)
txtPartTime.Text = dt.Rows(0)(6)
txtPassword.Text = dt.Rows(0)(9)
txtConfirmpassword.Text = dt.Rows(0)(10)
End Sub
Protected Sub txtEmployeeUser_id_TextChanged(sender As Object, e As EventArgs) Handles txtEmployee_id.TextChanged, txtUserName.TextChanged
Dim intMode As Integer
If sender Is txtEmployee_id Then
intMode = 2
ElseIf sender Is txtUserName Then
intMode = 3
End If
Dim query As String = gclass.SPEmployeeCall("Q", intMode, txtUserName.Text, Nothing, Nothing, _
txtEmployee_id.Text, Nothing, Nothing, _
Nothing, Nothing, _
Nothing, Nothing)
lblEmployeeID.Visible = True
lblEmployeeID.Text = gclass.DatabaseMessages(query)
End Sub
Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
If Session.Contents("Employee") Is Nothing Then
Response.Redirect("Login.aspx")
Else
employeeData = Session("Employee")
End If
If Not IsPostBack And drpEmployee.SelectedIndex = -1 Then
Session.Contents("EmployeeDDL") = gclass.LoadEmployeeAbsent(drpEmployee, 99)
End If
checkboxDRPemployee()
End Sub
Protected Sub drpEmployee_SelectedIndexChanged(sender As Object, e As EventArgs) Handles drpEmployee.SelectedIndexChanged
intEmployee = Session.Contents("EmployeeDDL")
If drpEmployee.SelectedIndex <> 0 Then
Dim query As String = gclass.SPEmployeeCall("Q", 7, Nothing, Nothing, Nothing, intEmployee(drpEmployee.SelectedIndex), Nothing, Nothing, Nothing, Nothing, Nothing, Nothing)
Dim dt As DataTable = gclass.Mysql_CreateDataTable(query)
clearFields(dt)
Else
clearFields()
End If
End Sub
Sub checkboxDRPemployee()
If drpEmployee.SelectedIndex <> 0 Then
CheckBox1.Enabled = True
CheckBox1.Checked = False
Else
CheckBox1.Enabled = False
CheckBox1.Checked = False
End If
End Sub
Protected Sub btnClear_Click(sender As Object, e As EventArgs) Handles btnClear.Click
clearFields()
End Sub
Protected Sub txtpassword_ServerValidate(source As Object, args As ServerValidateEventArgs)
If Not CheckBox1.Checked Then
args.IsValid = (txtPassword.Text <> "")
End If
End Sub
Protected Sub txtConfirmpassword_ServerValidate(source As Object, args As ServerValidateEventArgs)
If Not CheckBox1.Checked Then
args.IsValid = (txtPassword.Text = txtConfirmpassword.Text)
End If
End Sub
Protected Sub chkChecked(sender As Object, e As EventArgs) Handles CheckBox1.CheckedChanged
Dim thisValue As Boolean = CheckBox1.Checked
txtPassword.Enabled = CheckBox1.Checked
txtConfirmpassword.Enabled = CheckBox1.Checked
End Sub
End Class
Thank you in advance
Kindest Regards
Douglas Leekam

Answer 1

This definitely has something to do with AutoPostBack="true"
Try to debug by changing to:
<asp:CheckBox ID="CheckBox1" runat="server" OnCheckedChanged="chkChecked" />
Not sure what the functionality of your code is, but you might want to wrap page load code inside
If Not Page.IsPostBack Then
// code currently in page load
End If

Answer 2

You can use javascript to check whether checkbox is checked or not based on value you can disable the control from javascript itself. You can use javascript onchange event to check checkbox value.