Custom Control Error Message

digioz · July 23, 2006

Hello Everyone,

I am having a bit of a problem with a custom ASP.NET Control written in VB when I post the form and try to access the text of the custom control. Here is what I have:

' Custom Control Called ctlAddress with 1 label called lblAddress and one textbox called txtAddress
'--------------------------------------------------------------------------------------------------
Public Class ctlAddress
   Inherits System.Web.UI.UserControl

   Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
       'Put user code to initialize the page here
   End Sub

   Public Property Address() As String
       Get
           Return txtAddress.Text
       End Get
       Set(ByVal Value As String)
           txtAddress.Text = Value
       End Set
   End Property

End Class

' HTML View of Actual ASP.NET Page that references the custom control above called WebForm1.aspx
'-----------------------------------------------------------------------------------------------
<%@ Register TagPrefix="uc1" TagName="ctlAddress" Src="controls/ctlAddress.ascx" %>
<%@ Page Language="vb" AutoEventWireup="false" Codebehind="WebForm1.aspx.vb" Inherits="WebApplication1.WebForm1"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
	<title>WebForm1</title>
	<meta name="GENERATOR" content="Microsoft Visual Studio .NET 7.1">
	<meta name="CODE_LANGUAGE" content="Visual Basic .NET 7.1">
	<meta name="vs_defaultClientScript" content="JavaScript">
	<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body MS_POSITIONING="GridLayout">
	<form id="Form1" method="post" runat="server">
			<uc1:ctlAddress id="CtlAddress1" runat="server"></uc1:ctlAddress></DIV>
			<asp:Button id="btnSubmit" style="Z-INDEX: 105; LEFT: 320px; POSITION: absolute; TOP: 208px"
			runat="server" Text="Submit"></asp:Button>
	</form>
</body>
</HTML>

' Code behind for the WebForm1.aspx
-----------------------------------
Public Class WebForm1
   Inherits System.Web.UI.Page

   Dim myCtlAddress As ctlAddress

   Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
       'Put user code to initialize the page here
   End Sub

   Private Sub btnSubmit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSubmit.Click
       myCtlAddress = New ctlAddress

       addr = myCtlAddress.Address

       lblOutput.Visible = True
       lblOutput.Text = addr
   End Sub

End Class

' Error Message that appears is as follows
'-----------------------------------------
Object reference not set to an instance of an object. 
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error: 


Line 29:     Public Property Address() As String
Line 30:         Get
Line 31:             Return txtAddress.Text
Line 32:         End Get
Line 33:         Set(ByVal Value As String)


Source File: c:\inetpub\wwwroot\WebApplication1\controls\ctlAddress.ascx.vb    Line: 31 

Stack Trace: 


[NullReferenceException: Object reference not set to an instance of an object.]
  WebApplication1.ctlAddress.get_Address() in c:\inetpub\wwwroot\WebApplication1\controls\ctlAddress.ascx.vb:31
  WebApplication1.WebForm1.btnSubmit_Click(Object sender, EventArgs e) in c:\inetpub\wwwroot\WebApplication1\WebForm1.aspx.vb:40
  System.Web.UI.WebControls.Button.OnClick(EventArgs e)
  System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)
  System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
  System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
  System.Web.UI.Page.ProcessRequestMain()

Does anyone know why the code above is generating the error?

Thanks!

digioz · July 24, 2006

Never mind all. This fixed the problem:

Protected WithEvents CtlAddress1 As ctlAddress

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