I created my own DbConnection class

using System;
using System.Data;
using System.Data.Common;
using System.Xml;

namespace MyNS
{
public sealed class MyConnection : DbConnection, ICloneable
{
// code implement DbConnection and ICloneable
...
}
}

But Visual Studio 2005 keeps complaining when I try to open this file as
follows:

One or more errors encountered while loading the designer. The errors are
listed below. Some errors can be fixed by rebuilding your project, while
others may require code changes.

The designer must create an instance of type
'System.Data.Common.DbConnection' but it cannot because the type is declared
as abstract.
Hide

at
System.ComponentModel.Design.Serialization.CodeDomSerializerBase.Error(IDesignerSerializationManager manager, String exceptionText, String helpLink)
at
System.ComponentModel.Design.Serialization.TypeCodeDomSerializer.Deserialize(IDesignerSerializationManager manager, CodeTypeDeclaration declaration)
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)


I also see the icon for the file changes and if I remove the DbConnection
that MyConnection is inherited from. It is working fine.

Any ideas about this.

I'm doing the same basic thing and getting the same error. I believe it's
because DbConnection (and DbCommand) are descended from Component. I just
right click on the class and select View Code. Everything else seems to work
and it compiles OK.

--
Tom Winter
(E-Mail Removed)

"Roy" <(E-Mail Removed)> wrote in message
news:8E27CA63-0824-4D52-9EA2-(E-Mail Removed)...
>I created my own DbConnection class
>
> using System;
> using System.Data;
> using System.Data.Common;
> using System.Xml;
>
> namespace MyNS
> {
> public sealed class MyConnection : DbConnection, ICloneable
> {
> // code implement DbConnection and ICloneable
> ...
> }
> }
>
> But Visual Studio 2005 keeps complaining when I try to open this file as
> follows:
>
> One or more errors encountered while loading the designer. The errors are
> listed below. Some errors can be fixed by rebuilding your project, while
> others may require code changes.
>
> The designer must create an instance of type
> 'System.Data.Common.DbConnection' but it cannot because the type is
> declared
> as abstract.
> Hide
>
> at
> System.ComponentModel.Design.Serialization.CodeDomSerializerBase.Error(IDesignerSerializationManager
> manager, String exceptionText, String helpLink)
> at
> System.ComponentModel.Design.Serialization.TypeCodeDomSerializer.Deserialize(IDesignerSerializationManager
> manager, CodeTypeDeclaration declaration)
> 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)
>
>
> I also see the icon for the file changes and if I remove the DbConnection
> that MyConnection is inherited from. It is working fine.
>
> Any ideas about this.

This link might help. I hope it comes through OK:

http://groups.google.com/group/micro...730d58cdb34ea6

-Tom


"Tom Winter" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> I'm doing the same basic thing and getting the same error. I believe it's
> because DbConnection (and DbCommand) are descended from Component. I just
> right click on the class and select View Code. Everything else seems to
> work and it compiles OK.
>
> --
> Tom Winter
> (E-Mail Removed)
>
> "Roy" <(E-Mail Removed)> wrote in message
> news:8E27CA63-0824-4D52-9EA2-(E-Mail Removed)...
>>I created my own DbConnection class
>>
>> using System;
>> using System.Data;
>> using System.Data.Common;
>> using System.Xml;
>>
>> namespace MyNS
>> {
>> public sealed class MyConnection : DbConnection, ICloneable
>> {
>> // code implement DbConnection and ICloneable
>> ...
>> }
>> }
>>
>> But Visual Studio 2005 keeps complaining when I try to open this file as
>> follows:
>>
>> One or more errors encountered while loading the designer. The errors are
>> listed below. Some errors can be fixed by rebuilding your project, while
>> others may require code changes.
>>
>> The designer must create an instance of type
>> 'System.Data.Common.DbConnection' but it cannot because the type is
>> declared
>> as abstract.
>> Hide
>>
>> at
>> System.ComponentModel.Design.Serialization.CodeDomSerializerBase.Error(IDesignerSerializationManager
>> manager, String exceptionText, String helpLink)
>> at
>> System.ComponentModel.Design.Serialization.TypeCodeDomSerializer.Deserialize(IDesignerSerializationManager
>> manager, CodeTypeDeclaration declaration)
>> 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)
>>
>>
>> I also see the icon for the file changes and if I remove the DbConnection
>> that MyConnection is inherited from. It is working fine.
>>
>> Any ideas about this.
>
>