timothyrmyers
asked on
Error using custom validation control
When I run the code below I get the error : Unknown server tag 'custom:LengthValidator'.
I have tried adding Assembly = "myProject" to the Register tag and that didn't hep. I'm using Visual Studio 2010 and ASP.Net 4.0. This is an example from ASP.Net 4 Unleashed.
ShowLengthValidator.aspx is below:
<%@ Page Language="VB" %>
<%@ Register TagPrefix="custom" Namespace="myControls" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Show Length Validator</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label
id="lblComments"
Text="Comments:"
AssociatedControlID="txtCo
Runat="server" />
<br />
<asp:TextBox
id="txtComments"
TextMode="MultiLine"
Columns="30"
Rows="2"
Runat="server" />
<custom:LengthValidator
id="valComments"
ControlToValidate="txtComm
Text="(Must be less than 10 characters)"
MaximumLength="10"
Runat="server" />
<br /><br />
<asp:Button
id="btnSubmit"
Text="Submit"
Runat="server" />
</div>
</form>
</body>
</html>
LengthValidator.vb code is below:
Imports System
Imports System.Web.UI
Imports System.Web.UI.WebControls
Namespace myControls
''' <summary>
''' Validates the length of an input field
''' </summary>
Public Class LengthValidator
Inherits BaseValidator
Dim _maximumLength As Integer = 0
Public Property MaximumLength() As Integer
Get
Return _maximumLength
End Get
Set(ByVal Value As Integer)
_maximumLength = value
End Set
End Property
Protected Overrides Function EvaluateIsValid() As Boolean
Dim value As String = Me.GetControlValidationVal
If value.Length > _maximumLength Then
Return False
Else
Return True
End If
End Function
End Class
End Namespace
I have tried adding Assembly = "myProject" to the Register tag and that didn't hep. I'm using Visual Studio 2010 and ASP.Net 4.0. This is an example from ASP.Net 4 Unleashed.
ShowLengthValidator.aspx is below:
<%@ Page Language="VB" %>
<%@ Register TagPrefix="custom" Namespace="myControls" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Show Length Validator</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label
id="lblComments"
Text="Comments:"
AssociatedControlID="txtCo
Runat="server" />
<br />
<asp:TextBox
id="txtComments"
TextMode="MultiLine"
Columns="30"
Rows="2"
Runat="server" />
<custom:LengthValidator
id="valComments"
ControlToValidate="txtComm
Text="(Must be less than 10 characters)"
MaximumLength="10"
Runat="server" />
<br /><br />
<asp:Button
id="btnSubmit"
Text="Submit"
Runat="server" />
</div>
</form>
</body>
</html>
LengthValidator.vb code is below:
Imports System
Imports System.Web.UI
Imports System.Web.UI.WebControls
Namespace myControls
''' <summary>
''' Validates the length of an input field
''' </summary>
Public Class LengthValidator
Inherits BaseValidator
Dim _maximumLength As Integer = 0
Public Property MaximumLength() As Integer
Get
Return _maximumLength
End Get
Set(ByVal Value As Integer)
_maximumLength = value
End Set
End Property
Protected Overrides Function EvaluateIsValid() As Boolean
Dim value As String = Me.GetControlValidationVal
If value.Length > _maximumLength Then
Return False
Else
Return True
End If
End Function
End Class
End Namespace
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Amandeep Singh Bhullar
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