Object reference not set to an instance of an object.

[livmacca]

Hi,

I am new to VB .Net programming and is trying to create a webpage. I encountered the following error and is totally clueless on how to make it work:

==================ERROR=========================== =======
Object reference not set to an instance of an object.


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:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]
ICAPS_admin.WebForm1.Page_Load(Object sender, EventArgs e)
System.Web.UI.Control.OnLoad(EventArgs e)
System.Web.UI.Control.LoadRecursive()
System.Web.UI.Page.ProcessRequestMain()

================================================== =======

My webpage that I am trying to load is a very simple one which consist of only 3 dropdown list and 2 textbox. Below is my VB code:


==================Code ===================================

Public Class WebForm1
    Inherits System.Web.UI.Page
 
#Region " Web Form Designer Generated Code "
 
    'This call is required by the Web Form Designer.
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
 
    End Sub
    Protected WithEvents LabelSearchGemSecNo As System.Web.UI.WebControls.Label
    Protected WithEvents txtBoxGemSecNo As System.Web.UI.WebControls.TextBox
    Protected WithEvents LabelSearchUserID As System.Web.UI.WebControls.Label
    Protected WithEvents txtBoxUserID As System.Web.UI.WebControls.TextBox
    Protected WithEvents LabelStatus As System.Web.UI.WebControls.Label
    Protected WithEvents LabelCAtype As System.Web.UI.WebControls.Label
    Protected WithEvents LabelIndicator As System.Web.UI.WebControls.Label
    Protected WithEvents ddlStatus As System.Web.UI.WebControls.DropDownList
    Protected WithEvents ddlCAtype As System.Web.UI.WebControls.DropDownList
    Protected WithEvents ddlIndicator As System.Web.UI.WebControls.DropDownList
 
    'NOTE: The following placeholder declaration is required by the Web Form Designer.
    'Do not delete or move it.
    Private designerPlaceholderDeclaration As System.Object
 
    Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init
        'CODEGEN: This method call is required by the Web Form Designer
        'Do not modify it using the code editor.
        InitializeComponent()
    End Sub
 
#End Region
 
    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 ddlCAtype_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ddlCAtype.SelectedIndexChanged
 
    End Sub
End Class
 

================================================== =======

Can anyone advise on this pls?

Thanks and regards,

livmacca

[balabaster]

Put a breakpoint on the Page_Load event and run your web application. When the breakpoint is reached hit F11 to step through the application. What is the exact line of code executed when this error occurs?

I'm failing to see anything wrong with the code you provided - so if you've provided everything in your project, then I'm thinking that it's an environment problem. But I'd rather not tell you that your Visual Studio needs reinstalling - lord knows it takes long enough.

[nev]

Check to see if anything being referenced is null or has valid data type.

[Plater]

This is a VS2003 web application right? (In VS2005 you don't see the designer code like that)
Did you leave out any code? it looks like your page_load event is empty, but that's where it says the error is comming from?

[livmacca]

Put a breakpoint on the Page_Load event and run your web application. When the breakpoint is reached hit F11 to step through the application. What is the exact line of code executed when this error occurs?

I'm failing to see anything wrong with the code you provided - so if you've provided everything in your project, then I'm thinking that it's an environment problem. But I'd rather not tell you that your Visual Studio needs reinstalling - lord knows it takes long enough.

Hi,

I guess it is the environment issue as it went away after i reinstalled VS 2003. Thanks for your reply! :)