digioz
Member
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:
Does anyone know why the code above is generating the error?
Thanks!
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
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<%@ 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!