Custom Control Error Message

D

digioz

Newcomer
Joined
Oct 12, 2005
Messages
18
Location
Chicago, IL
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:

Code: 
' 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!
 
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