Why I get a error in Designer when I add a class Just above the Form class

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When I added a class just above the form class my form designer not loading it showing error as given below as in call stack

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at System.ComponentModel.Design.Serialization.CodeDomDesignerLoader.EnsureDocument(IDesignerSerializationManager manager)
at System.ComponentModel.Design.Serialization.CodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager manager)
at Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager serializationManager)
at System.ComponentModel.Design.Serialization.BasicDesignerLoader.BeginLoad(IDesignerLoaderHost host)

My code is like this :

C#

namespace WindowsFormsApplication1
{
 public class myclass
 {
    int mymember;
 }
 public partial class Form1 : Form
 {
    public Form1()
   {
            InitializeComponent();
    }
 }
}

where ever I comment the myclass I am able to see windows forms design. when I uncomment this it shows error again in showing the design.

Do any one knows why happens like this???

Thanks in Advance.

Posted 9-Aug-15 20:11pm

sreeyush sudhakaran

Updated 18-Dec-18 18:04pm

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Comments

Sergey Alexandrovich Kryukov 10-Aug-15 2:32am

Are you saying that if you remove 4 lines, the definition of myclass, the application starts to work and the form start to show in the designer?
If this is so, I cannot see a reason for a problem in this fragment of code. I would advice one thing: don't abuse or overuse the designer. I try not to minimize adding any code in this file. This is a partial class, so you can add you code in another file...
—SA

DamithSL 10-Aug-15 2:39am

Try these solutions[^]

sreeyush sudhakaran 10-Aug-15 2:54am

this solution works,i tried but may i know what is the reason behind this?

DamithSL 10-Aug-15 2:57am

it seems bug in Visual studio

sreeyush sudhakaran 10-Aug-15 3:02am

ok..thank you, I came across same scenarios when i was doing a conversion project from vb6 to vb .net also that time unsupported controls made the bugs but here it looks strange , nothing just a class causing trouble.

I hope visual studio needs something like this

"The class Form1 can be designed, but is not the first class in the file. Visual Studio requires that designers use the first class in the file. Move the class code so that it is the first class in the file and try loading the designer again."

2 solutions

Solution 2

The problem is because you add some class above the form1 class or whatever your form name. to resolve this error you need to add classes which you want to add below the form class.

Posted 18-Dec-18 18:05pm

SagarJaybhay1

Comments

CHill60 19-Dec-18 4:49am

No different to Solution 1

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OriginalGriff · Accepted Answer · 2015-08-09T21:04:00

In VS 2013, you get an error message when you try this:

The class frmInformation can be designed, but is not the first class in the file.  Visual Studio requires that designers use the first class in the file.  Move the class code so that it is the first class in the file and try loading the designer again.

There is a good chance that you get this message as well.

It's a restriction on how the VS designer works, is all. Embed your new class within Form1 or add it at the end of the file instead of the start (or better, put it in it's own file so it is easy to find)