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Value Cannot Be Null. Parameter Name Objecttype Vb.net

Posted by kliss on 9/10/2010 at 12:50 AM changing the class modifier from 'friend" to 'public' in VB.NET solves this issue for me Posted by Larry4321 on 7/28/2010 at 1:53 PM The designer offer us the choice to ignore the error and go on editing...using that I had two possible results: The form opens up correctly in the designer without altering the Now try to open the Form1 in designer mode. UPDATE: I had to instead add the handler with AddHandler statement. his comment is here

The last code you deleted was the problem. Form2 inherits Form1, so Form2 has now Button1 of inherited form1 and its own Button2 also there. You’ll be auto redirected in 1 second. A complete environment crash.

Posted by Microsoft on 7/27/2010 at 8:46 PM Thanks for reporting this issue. JMC does tend to be a bit short with people who do such a poor job of asking a question (though it depends on the day), but that hardly justifies you Posted by Larry4321 on 7/29/2010 at 5:21 AM This is going to sound bizarre, but I'll let you know anyway. The warning does not provide any line numbers nor does the help topic pull up anything but a blank screen.

  1. See more: VB VB.NET I am getting a argument null exception error in one of my subs: If MD5Text.Text.Contains(labelX12) Then CheckedListBoxControl1.Items.Add(fs.FullName) lblvirus.Text = CheckedListBoxControl1.Items.Count End If MD5Text.Text = MD5Reader.ReadToEnd and labelx12
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  3. Some forms are opened normally, but some give the mentioned mistake.
  4. As I said before our form hierarchy inheritance tree is quite deep, so I added a third form inherited from Form2 and again I attached the event manually: Public Class Form3
  5. VS always seems to blow up when you move stuff around, I was making some fairly heavy changes to the UI and renaming controls to make them easier to find.
  6. Check the upper/lower case on your event names!
  7. I do have backups and could restore from them but I have done a lot of code since the back up and I don't want to do that if the fix
  8. Forum New Posts FAQ Calendar Forum Actions Mark Forums Read Quick Links Today's Posts View Site Leaders What's New?

UPDATE: I had to instead add the handler with AddHandler statement. Working on one of my legacy project I converted from VS2008 to VS2010, I had to edit some forms and when I tried to open them in the designer I got Most of us will think that the code that is used to write a control like that would be difficult. I stumbled across away to get around this issue.

this is what I did after receiving the "value cannot be null" error if you need more info just reply and i'll get back to you. Parameter name: source Value cannot be null. then it begins to work.I noticed that in the recently released VS2015 there is a new designer option that says "Run project code (if available)" if that is turned on then This happens when an event handler contains a reference to a non-existing object.

To understand recursion, you must first understand recursion. Reply With Quote May 14th, 2012,03:21 PM #12 alexkn View Profile View Forum Posts Member Join Date May 2011 Location Russia, N.Novgorod Posts 35 Re: Help !!! "value cannot be null" Parameter name: objectType at System.ComponentModel.TypeDescriptor.TypeDescriptionNode.GetRuntimeType(Type objectType) at System.ComponentModel.TypeDescriptionProvider.GetRuntimeType(Type reflectionType) at Microsoft.VisualStudio.Design.MultiTargetingContextProvider.GetRuntimeType(Type objectType) at Microsoft.VisualStudio.Design.Serialization.CodeDom.HandlesClauseManager.GetFieldType(String fieldName, Type documentBaseType) at Microsoft.VisualStudio.Design.Serialization.CodeDom.HandlesClauseManager.GetReferencedComponentType(String componentName, CodeTypeDeclaration codeTypeDecl, ITypeResolutionService loader, IDictionary& cache) at Microsoft.VisualStudio.Design.Serialization.CodeDom.HandlesClauseManager.ParseHandlesClauses(CodeTypeDeclaration codeTypeDecl, Boolean updateCache) Parameter name: objectType - by Larry4321 Status : Closed as Not Reproducible Not Reproducible The product team could not reproduce this item with the description and steps provided.

To understand recursion, you must first understand recursion. Posted by KeythH on 8/17/2011 at 12:28 PM I echo sophie396 Posted by sophie396 on 11/18/2010 at 4:01 PM This bug should not be closed.I have exactly the same problem. I then rebuilt the solution and of course I got a slew of build errors. Wave your little badge around less and learn more.

Parameter name: objectType" when opening a VB.NET Windows Forms in designer I have Windows Forms App in VB.NET it runs fine, I added some code event manually, without designer, like this: this content Parameter name: objectType at System.ComponentModel.TypeDescriptor.TypeDescriptionNode.GetRuntimeType(Type objectType) at System.ComponentModel.TypeDescriptionProvider.GetRuntimeType(Type reflectionType) at Microsoft.VisualStudio.Design.MultiTargetingContextProvider.GetRuntimeType(Type objectType) at Microsoft.VisualStudio.Design.Serialization.CodeDom.HandlesClauseManager.GetFieldType(String fieldName, Type documentBaseType) at Microsoft.VisualStudio.Design.Serialization.CodeDom.HandlesClauseManager.GetReferencedComponentType(String componentName, CodeTypeDeclaration codeTypeDecl, ITypeResolutionService loader, IDictionary& cache) at Microsoft.VisualStudio.Design.Serialization.CodeDom.HandlesClauseManager.ParseHandlesClauses(CodeTypeDeclaration codeTypeDecl, Boolean updateCache) Are all "Most Valued Professionals" so unprofessional? Last edited by i-m-t; Jul 28th, 2010 at 08:16 AM.

SAKryukov 5-Oct-11 17:17pm How come you can be unsure? To understand recursion, you must first understand recursion. Any help appreciated as I am heading for a nervous breakdown. weblink If it occurs at run time then you know that a value is null that isn;t allowed to be, so check which value on that line is null.

Reply With Quote May 14th, 2012,04:41 PM #13 S0LARIS View Profile View Forum Posts Lively Member Join Date Apr 2011 Posts 121 Re: Help !!! "value cannot be null" Paramater name: Lo and behold, when I tried bringing the form up in the designer it loaded ok. Join our community for more solutions or to ask questions.

Parameter name: type in DotNetNuke error: Value cannot be null.

I noticed that there are other posts that report a similar problem that results in Handles clauses being removed from code. I tried adding the Handles clauses back, but the next time Reply With Quote Feb 14th, 2013,12:01 PM #21 dunfiddlin View Profile View Forum Posts PowerPoster Join Date Jun 2012 Posts 8,241 Re: Help !!! "value cannot be null" Paramater name: objectType Posted by Price Brattin on 10/5/2013 at 2:45 PM I used the workaround posted by kliss on 9/10/2010 (shown below) and it worked! Join them; it only takes a minute: Sign up Error “Value cannot be null.

I voted 4. --SA Dale Seeley 5-Oct-11 17:11pm Thank you guys very much I appricate this allot I have changed the code as mehdi has said and even thoe One of our controls got renamed, so it was CtlBlah instead of ctlBlah. Your general advice is good though. check over here Reply With Quote May 15th, 2012,08:09 AM #14 alexkn View Profile View Forum Posts Member Join Date May 2011 Location Russia, N.Novgorod Posts 35 Re: Help !!! "value cannot be null"

Visual Studio Designer - Value cannot be null. Thanks, Gangadhar Marked as answer by gdhar Thursday, April 07, 2011 1:35 PM Thursday, April 07, 2011 1:35 PM Microsoft is conducting an online survey to understand your opinion of the Please give us a demo project to demonstrate this issue so that we can conduct further research.It would be greatly appreciated if you could provide us with that information as quickly Browse other questions tagged vb.net winforms visual-studio-2010 or ask your own question.

So I gave an in-depth look at what Visual Studio is telling me with this error: walking the stack trace you can find that the HandlesClauseManager class is actually the source Open the form designer. If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Protected Shadows WithEvents Button1 As System.Windows.Forms.Button = MyBase.Button1 Compile all the projects and issue will be resolved.

The event was still in lower case. First Name Please enter a first name Last Name Please enter a last name Email We will never share this with anyone. If I do so, the mistake repeats. The stack says its null.

That's way I posted the other answer. –Fernando Gonzalez Sanchez Oct 9 '14 at 20:36 what if you don't know the event that you need to remove the "handles"