StroreDataBound Error: Object reference not set to an instance of an object

[Bubu]

Hi guys,

I have an error a little bit similar to this thread: http://forums.ext.net/showthread.php...om-code-behind
Only that it isn't a calendar.

I have a user control (uc) on the master page. There's only a store (XML from a Web-Service) and a window it (including a few properties to access it). In the Page_Load event I set the store Url with

  CType(JobStore.Proxy.Proxy, HttpProxy).Url = My.Settings.JobSearchUrl.Replace("{CUST_ID}", Session("myvar"))

It comes up fine the first time but when I switch the "myvar" I get this stack trace:

System.NullReferenceException was unhandled by user code
HResult=-2147467261
Message=Object reference not set to an instance of an object.
Source=System.Xml
StackTrace:
at System.Xml.XmlLoader.Load(XmlDocument doc, XmlReader reader, Boolean preserveWhitespace)
at System.Xml.XmlDocument.Load(XmlReader reader)
at System.Web.UI.WebControls.XmlDataSource.PopulateXm lDocument(XmlDocument document, CacheDependency& dataCacheDependency, CacheDependency& transformCacheDependency)
at System.Web.UI.WebControls.XmlDataSource.GetXmlDocu ment()
at System.Web.UI.WebControls.XmlDataSourceView.Execut eSelect(DataSourceSelectArguments arguments)
at System.Web.UI.DataSourceView.Select(DataSourceSele ctArguments arguments, DataSourceViewSelectCallback callback)
at Ext.Net.StoreDataBound.PerformSelect() in C:\Users\Geoffrey McGill\Documents\Visual Studio 2010\Projects\Ext.NET\v1\Ext.Net\Ext\Data\StoreDat aBound.cs:line 790
at Ext.Net.StoreDataBound.DataBind() in C:\Users\Geoffrey McGill\Documents\Visual Studio 2010\Projects\Ext.NET\v1\Ext.Net\Ext\Data\StoreDat aBound.cs:line 254
at Ext.Net.StoreDataBound.EnsureDataBound() in C:\Users\Geoffrey McGill\Documents\Visual Studio 2010\Projects\Ext.NET\v1\Ext.Net\Ext\Data\StoreDat aBound.cs:line 318
at Ext.Net.StoreDataBound.OnPreRender(EventArgs e) in C:\Users\Geoffrey McGill\Documents\Visual Studio 2010\Projects\Ext.NET\v1\Ext.Net\Ext\Data\StoreDat aBound.cs:line 388
....
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

I couldn't figure out why this comes up. It seems that the Xml is written in an non-existing store.
Something really useful regarding to this problem I haven't found in the forum until now.

I have no idea, how to prevent or solve that. In the StoreDataBound.cs line 388 etc. isn't any unusual in.

Any ideas?

Regards,

Frank

[Baidaly]

Hello!

System.NullReferenceException was unhandled by user code
HResult=-2147467261
Message=Object reference not set to an instance of an object.
Source=System.Xml
StackTrace:
at System.Xml.XmlLoader.Load(XmlDocument doc, XmlReader reader, Boolean preserveWhitespace)
at System.Xml.XmlDocument.Load(XmlReader reader)

I think that the main problem is not in Ext.NET Store it's in your XML because StackTrace shows that exception occurs in a XmlLoader. Please, double check it.

[Bubu]

Hi Baidaly,

it includes field definitions and field sizes. The usual Microsoft stuff as a result of a returned DataTable.
The XML itself looks fine.

Regards,

Frank