ObjectDataSourc e Error

[Angel]

I created a Dataset Type on one project which generates a DLL. I have a web
project . I created a webpage with a gridview. I attached an ObjectDatasourc e
to the Dataset type from my other project. I assigned the Insert, Update, and
select to the ObjectDataSourc e. I attached the gridview control to the
ObjectDataSourc e. I run it and edit a record in the grid. When I hit the
update, I get the following error:

-------------------------------------------------------------------------------
Object of type 'System.Int16' cannot be converted to type
'System.Nullabl e`1[System.Int32]&'.

[ArgumentExcepti on: Object of type 'System.Int16' cannot be converted to
type 'System.Nullabl e`1[System.Int32]&'.]
System.RuntimeT ype.CheckValue( Object value, Binder binder, CultureInfo
culture, BindingFlags invokeAttr) +843
System.Reflecti on.MethodBase.C heckArguments(O bject[] parameters, Binder
binder, BindingFlags invokeAttr, CultureInfo culture, Signature sig) +199
System.Reflecti on.RuntimeMetho dInfo.Invoke(Ob ject obj, BindingFlags
invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean
skipVisibilityC hecks) +325
System.Reflecti on.RuntimeMetho dInfo.Invoke(Ob ject obj, BindingFlags
invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) +29

System.Web.UI.W ebControls.Obje ctDataSourceVie w.InvokeMethod( ObjectDataSourc eMethod method, Boolean disposeInstance , Object& instance) +482

System.Web.UI.W ebControls.Obje ctDataSourceVie w.InvokeMethod( ObjectDataSourc eMethod method) +38
System.Web.UI.W ebControls.Obje ctDataSourceVie w.ExecuteUpdate (IDictionary
keys, IDictionary values, IDictionary oldValues) +2573
System.Web.UI.D ataSourceView.U pdate(IDictiona ry keys, IDictionary values,
IDictionary oldValues, DataSourceViewO perationCallbac k callback) +78
System.Web.UI.W ebControls.Grid View.HandleUpda te(GridViewRow row, Int32
rowIndex, Boolean causesValidatio n) +1215
System.Web.UI.W ebControls.Grid View.HandleEven t(EventArgs e, Boolean
causesValidatio n, String validationGroup ) +858
System.Web.UI.W ebControls.Grid View.OnBubbleEv ent(Object source, EventArgs
e) +95
System.Web.UI.C ontrol.RaiseBub bleEvent(Object source, EventArgs args) +35
System.Web.UI.W ebControls.Grid ViewRow.OnBubbl eEvent(Object source,
EventArgs e) +117
System.Web.UI.C ontrol.RaiseBub bleEvent(Object source, EventArgs args) +35
System.Web.UI.W ebControls.Link Button.OnComman d(CommandEventA rgs e) +115
System.Web.UI.W ebControls.Link Button.RaisePos tBackEvent(Stri ng
eventArgument) +163

System.Web.UI.W ebControls.Link Button.System.W eb.UI.IPostBack EventHandler.Ra isePostBackEven t(String eventArgument) +7
System.Web.UI.P age.RaisePostBa ckEvent(IPostBa ckEventHandler
sourceControl, String eventArgument) +11
System.Web.UI.P age.RaisePostBa ckEvent(NameVal ueCollection postData) +174
System.Web.UI.P age.ProcessRequ estMain(Boolean
includeStagesBe foreAsyncPoint, Boolean includeStagesAf terAsyncPoint) +5102


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Now I checked the values in the DataSource_Upda ting event and the fields for
update are of the correct format. What is wrong here?

Also how can I debug my DataSetType Classes. I placed a breakpoint to the
Update Method of the Dataset.Designe r.vb class file, but it never breaks. The
project is referenced in the Web Project. The Dataset Type DLL is also
compiled for DEBUG. So why is it not breaking?