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Problem Please help.
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Leeb65 View Drop Down
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Joined: 05 December 2003
Location: Germany
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Points: 62 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Leeb65 Quote  Post ReplyReply Direct Link To This Post Topic: Problem Please help.
    Posted: 30 June 2005 at 8:37am
I have a website in development, I changed a line of code in another form and got the following error in the login.
 

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.]
   System.Web.UI.Control.OnBubbleEvent(Object source, EventArgs args)
   System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args)
   System.Web.UI.WebControls.Button.OnCommand(CommandEventArgs 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()
 
The code I changed is not related to this page and I have taken the code out again, but I still get this error.
 
Does anyone have the slightest idea what it could be.
 
I have done a debug trace and everything executes correctly then when it leaves my code the error comes.
 
Thanks
 
Lee
Lee


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michael View Drop Down
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Joined: 08 April 2002
Location: United States
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Points: 4670 		Post Options Post Options   Thanks (0) Thanks(0)   Quote michael Quote  Post ReplyReply Direct Link To This Post Posted: 01 July 2005 at 6:00pm
It's a Null Reference Exception. Even though the code seems to be OK, you are querying something which does not exist aka is NULL. For example you have
Dim arr as array
For each s as string in arr
...
Next
Would cause a Null Reference Exception as arr does not have any members. If you put some clause to check for NULL around it, your code will surely run. (If I don't make sense, it's cause I am tired, hope you get the idea).
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Leeb65 View Drop Down
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Joined: 05 December 2003
Location: Germany
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Points: 62 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Leeb65 Quote  Post ReplyReply Direct Link To This Post Posted: 04 July 2005 at 2:52am
Michael,
 
Thanks for the reply, I honestly don't know what happened, but I restarted the computer and it all started to work again.
 
I had a problem the other week where the debugger said there was no source for the code I was running, reboot and it worked again.
 
thanks,
 
Lee


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