"Unrecognized configuration section connectionStrings."

Question

I had been working on a project in VS2005 that utilized a local connection to an Access DB.

In the past week, I installed .NET framework 3.5 for use w/ a different project as well as VS6.

I went back to my VS2005 application and suddenly there are big issues:

In the designer for any class utilizing my OLEDB connection showed this:

Unable to cast object of type 'System.Configuration.DefaultSection' to type 'System.Configuration.ConnectionStringsSection'. Hide

at System.Configuration.Configuration.get_ConnectionStrings() at Microsoft.VisualStudio.Shell.Design.Serialization.ConfigurationHelperService.ReadConnectionStrings(String configFileName, DocData configDocData, String prefix) at Microsoft.VisualStudio.Editors.SettingsDesigner.AppConfigSerializer.Deserialize(DesignTimeSettings Settings, String SectionName, DocData AppConfigDocData, MergeValueMode mergeMode, IUIService UIService) at Microsoft.VisualStudio.Editors.SettingsGlobalObjects.SettingsFileGlobalObject.LoadSettings(String fileName) at Microsoft.VisualStudio.Editors.SettingsGlobalObjects.SettingsFileGlobalObject.BuildType() at Microsoft.VisualStudio.Editors.SettingsGlobalObjects.SettingsFileGlobalObject.GetObjectType() at Microsoft.VisualStudio.Shell.Design.GlobalType.get_ObjectType() at Microsoft.VisualStudio.Shell.Design.GlobalObject.GetHashCode() at Microsoft.VisualStudio.Shell.Design.GlobalObjectService.GlobalKey.GetHashCode() at System.Collections.Generic.ObjectEqualityComparer1.GetHashCode(T obj) at System.Collections.Generic.Dictionary2.FindEntry(TKey key) at Microsoft.VisualStudio.Shell.Design.GlobalObjectService.GetGlobalObjects(Type baseType) at Microsoft.VisualStudio.Shell.Design.GlobalObjectService.GetGlobalObjects() at Microsoft.VisualStudio.Design.Serialization.CodeDom.AggregateTypeResolutionService.GetTypeFromGlobalObjects(String name, Boolean throwOnError, Boolean ignoreCase) at Microsoft.VisualStudio.Design.Serialization.CodeDom.AggregateTypeResolutionService.GetType(String name, Boolean throwOnError, Boolean ignoreCase) at Microsoft.VisualStudio.Design.Serialization.CodeDom.AggregateTypeResolutionService.GetType(String name, Boolean throwOnError) at System.ComponentModel.Design.Serialization.CodeDomSerializerBase.GetType(ITypeResolutionService trs, String name, Dictionary2 names) at System.ComponentModel.Design.Serialization.CodeDomSerializerBase.FillStatementTable(IDesignerSerializationManager manager, IDictionary table, Dictionary2 names, CodeStatementCollection statements, String className) 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 Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomDesignerLoader.DeferredLoadHandler.Microsoft.VisualStudio.TextManager.Interop.IVsTextBufferDataEvents.OnLoadCompleted(Int32 fReload)

And when I ran the app, I encounter the following exception on startup:

"Unrecognized configuration section connectionStrings."

In looking online, these issues seem to commonly relate to things built in VS2005 and deployed on .net 1.1 framework; but this is all running as a windows forms application locally within VS (not on IIS). I've tried uninstalling and reinstalling VS2K5 to no avail.

Any thoughts? Thanks, Matt

Answer 1

This is a wild guess... but I think I've seen this before when you have something before the <configSections> element in your web.config. For example, this would cause an error:

<configuration>
  <connectionStrings [...] />
  <configSections>
    <sectionGroup name=[...] />
  </configSections>
</configuration>

The <configSections> element needs to come first:

<configuration>
  <configSections>
    <sectionGroup name=[...] />
  </configSections>
  <connectionStrings [...] />
</configuration>

Probably not what's causing your problem but I thought I'd mention it...

Answer 2

i had been facing the same issue.please check your machine.config file. and when i removed the it again work fine..