Discuss "Object reference not set to an instance of an object" in the .Net Development forum.

Shem · #1 July 22nd, 2008, 04:21 AM

err msg: and yes i did read the sticky

Code:

 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 329:
Line 330:                    Dim lbPageNumber As LinkButton
Line 331:                    lbPageNumber.Text = x.ToString()
Line 332:                    lbPageNumber.CommandName = "PageNumber"
Line 333:                    lbPageNumber.CommandArgument = x


Source File: C:\Inetpub\wwwroot\keithdesign\views\projects.aspx.vb    Line: 331

Stack Trace:

[NullReferenceException: Object reference not set to an instance of an object.]
   view_projects.DrawPaging(Int32 pageNumber, Int32 pageCount) in C:\Inetpub\wwwroot\keithdesign\views\projects.aspx.vb:331
   view_projects.Populate_rpProjectList(Params myParams) in C:\Inetpub\wwwroot\keithdesign\views\projects.aspx.vb:83
   view_projects.Page_Load() in C:\Inetpub\wwwroot\keithdesign\views\projects.aspx.vb:26
   System.Web.Util.CalliHelper.ArglessFunctionCaller(IntPtr fp, Object o) +5
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +858603
   System.Web.UI.Control.OnLoad(EventArgs e) +99
   System.Web.UI.Control.LoadRecursive() +47
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1436

error line in red:

Code:

Dim x, y, z, pageEnd, pageStart As Integer
 For x = pageStart To pageEnd
                If x = pageNumber Then
                    'sb.Append("<strong>[")
                    'sb.Append(x)
                    'sb.Append("]</strong>&nbsp;&nbsp;")

                    Dim lbPageNumber As LinkButton
                    lbPageNumber.Text = x
                    lbPageNumber.CommandName = "PageNumber"
                    lbPageNumber.CommandArgument = x
                    lbPageNumber.Visible = True
                    lbPageNumber.Enabled = False
                    lbPageNumber.Font.Bold = True
                    AddHandler lbPageNumber.Command, AddressOf lblPageLinks_OnClick
                    pnlPagelinks.Controls.Add(lbPageNumber)
                Else
                    'sb.Append("<a href=")
                    'sb.Append(DrawLink(x))
                    'sb.Append(">")
                    'sb.Append(x)
                    'sb.Append("</a>&nbsp;&nbsp;")

                    Dim lbPageNumber As LinkButton
                    lbPageNumber.Text = x
                    lbPageNumber.CommandName = "PageNumber"
                    lbPageNumber.CommandArgument = x
                    lbPageNumber.Visible = True
                    AddHandler lbPageNumber.Command, AddressOf lblPageLinks_OnClick
                    pnlPagelinks.Controls.Add(lbPageNumber)
                End If
            Next

dunno why it's throwing that error? any ideas

Shem

richyrich · #2 July 22nd, 2008, 04:35 AM

I think it's because you don't set the instance of the LinkButton to an actual control on your page, so there's no instance of it.

It would be:-

Code:

Dim lbPageNumber As New LinkButton

Or

Code:

Dim lbPageNumber As LinkButton = your_linkbutton_id

Or

Code:

Dim lbPageNumber As LinkButton = some_control.FindControl("your_linkbutton_id")

I would guess it should be something like the last one.

Shem · #3 July 22nd, 2008, 04:44 AM

i'm trying to add LinkButton Controls to a panel control dynamically?

Shem · #4 July 22nd, 2008, 04:47 AM

Quote:

Originally Posted by richyrich

I think it's because you don't set the instance of the LinkButton to an actual control on your page, so there's no instance of it.

It would be:-

Code:

Dim lbPageNumber As New LinkButton

Or

Code:

Dim lbPageNumber As LinkButton = your_linkbutton_id

Or

Code:

Dim lbPageNumber As LinkButton = some_control.FindControl("your_linkbutton_id")

I would guess it should be something like the last one.

this one seems to have worked

Code:

Dim lbPageNumber As New LinkButton

thanks again for ya help

Shem · #5 July 22nd, 2008, 04:59 AM

W00T it works, and they are all added to my Panle Control too

now just to make sure that the events fire off

Shem

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
VBScript Functions Reference	jmurrayhead	ASP Development	25	October 21st, 2008 08:31 AM
Dynamically Reference Worksheet Cell/Range	BLaaaaaaaaaarche	Microsoft Office	2	June 18th, 2008 03:59 PM
Object reference not set to an instance of an object	jmurrayhead	.Net Development	1	May 29th, 2008 10:16 AM
[Error] Object Required?!?!?	jarvelous	ASP Development	2	March 20th, 2008 12:46 PM

The Following User Says Thank You to richyrich For This Useful Post:
Shem (July 22nd, 2008)

Discuss "Object reference not set to an instance of an object" in the .Net Development forum.

.Net Development - Learn about the Microsoft.Net framework and how to create powerful web-based (ASP.net) and client-based (Windows Forms) applications utilizing various languages such as C#, VB.Net, J# and others.