System.TypeLoadException Could not load type System.Configuration.SingleTagSect

[phillipmastroianni]

This is interesting, I have attached my web.config file
and the exception I have been logging. I created a
library which provide data access to a database and a
control system. The library is written in C#. I created
a small .exe file to test that the library builds
propertly from configuration and that it communicates
properly. This work great in the System.Windows.Forms.
However, when I use the library in a web enviroment
things don't go so well. I copy the unique instruction
in the app.config file the the web.config file. Bellow
is the exception generated, essentially the system
crashed when it tries to load
Systetem.Configuration.SingleTagSectionHandler which I
used in the web.config & app.config file.

Now WHY does the config file work in a desktop app
enviroment and when in a web enviroment I get problems!
Any suggestions on how to fix the problem would be much
appreciated.

I am using the 1.1 version on the Framework.

The following is the exception which I log :

Exception: System.Configuration.ConfigurationException
Message: Exception creating section handler.
(c:\inetpub\wwwroot\VBTestSorter\web.config line 7)
Source: System.Web
at
System.Web.Configuration.HttpConfigurationRecord.GetFactor
y(String configKey)
at
System.Web.Configuration.HttpConfigurationRecord.Evaluate
(String configKey, SectionRecord section)
at
System.Web.Configuration.HttpConfigurationRecord.GetConfig
(String configKey, Boolean cacheResult)
at
System.Web.Configuration.HttpConfigurationRecord.GetConfig
(String configKey, Boolean cacheResult)
at System.Web.HttpContext.GetConfig(String name)
at
System.Web.Configuration.HttpConfigurationSystemBase.Syste
m.Configuration.IConfigurationSystem.GetConfig(String
configKey)
at System.Configuration.ConfigurationSettings.GetConfig
(String sectionName)
at
Hinz.WeyerChem.Sorter.DataAccessLayer.Database.tables.Load
LotDAL.Initialize()

Nested Exception

Exception: System.TypeLoadException
Message: Could not load type
System.Configuration.SingleTagSectionHandler from
assembly System.Web, Version=1.0.5000.0, Culture=neutral,
PublicKeyToken=b03f5f7f11d50a3a.
Source: mscorlib
at System.Type.GetType(String typeName, Boolean
throwOnError)
at
System.Web.Configuration.HttpConfigurationRecord.GetFactor
y(String configKey)




This is an example of my web.config file :

<configSections>
<sectionGroup name="Sorter">
<section name="connectionString"
type="System.Configuration.SingleTagSectionHandler" />
<section name="sp_prefix"
type="System.Configuration.SingleTagSectionHandler" />
<section name="sp_sufix"
type="System.Configuration.SingleTagSectionHandler" />

</sectionGroup>
<section name="log4net"
type="log4net.Config.Log4NetConfigurationSectionHandler,lo
g4net" />
</configSections>

<Sorter>
<connectionString dsn="server=SQL-
01;uid=sa;pwd=password;database=SorterUpgrade" />
<sp_prefix insert="sp_Insert_"
delete="sp_Remove_" update="sp_Update_"
select="sp_Select_" />
<sp_sufix destination="Destination"
gradebutton="GradeButton" gradename="GradeName"
button="Button" lot="Lot"
nomThck="NominalThickness"
nomWid="NominalWidth" recalc="RecalcLength" run="Run"
wndThck="ThicknessWindow"
wndWid="WidthWindow" master="MasterSort" sort="Sort"
mastersort_sort="MasterSort_Sort"
status="Status" state="State" species="Species"
catThk="ThicknessCategory"
catWid="WidthCategory" pctWid="WidthCategroyPCT"
catLen="LengthCategory"
pctLen="LengthCategoryPCT" catGrd="GradeCategory"
pctGrd="GradeCategoryPCT"/>


</soreter
<log4net>

......
</log4net>