hi, i am trying q3 sp1.

i have function:

public void UpdateData()
{

this.CategoryView.AllowAddNewRow = false;
this.CategoryView.TableElement.RowHeight = 40;
this.CategoryView.ReadOnly = true;
this.CategoryView.TableElement.RowSpacing = 2;
this.CategoryView.TableElement.ShowSelfReferenceLines = true;
this.CategoryView.SelectionMode = Telerik.WinControls.UI.GridViewSelectionMode.FullRowSelect;

this.CategoryView.MasterTemplate.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill;
    DataTable source = CreateDataSource();    // this function work correct
if (this.CategoryView.DataSource != null)
{
string s = this.CategoryView.DataSource.ToString();           // s has a value
}
this.CategoryView.DataSource = source;  ///!!!!!!!!!!!!!!!!!!!!here i have problem  "Object reference not set to an instance of an object."

this.CategoryView.MasterTemplate.SortDescriptors.Add("lastupdate", ListSortDirection.Descending);
this.CategoryView.Relations.AddSelfReference(this.CategoryView.MasterTemplate, "id", "parent_id");
this.CategoryView.Columns["id"].IsVisible = false;
this.CategoryView.Columns["sn"].IsVisible = false;
this.CategoryView.Columns["parent_id"].IsVisible = false;
this.CategoryView.Columns["is_comment"].IsVisible = false;
this.CategoryView.Columns["fulltext"].IsVisible = false;
this.CategoryView.Columns["pubdate"].IsVisible = false;
this.CategoryView.Columns["source"].IsVisible = false;
this.CategoryView.Columns["category"].IsVisible = false;
this.CategoryView.Columns["lastupdate"].IsVisible = false;
this.CategoryView.Columns["title"].WrapText = true;
    }

the problem start from the second call of function, first call work fine:

System.NullReferenceException не обработано пользовательским кодом
Message="Object reference not set to an instance of an object."
Source="Telerik.WinControls.GridView"
StackTrace:
at Telerik.WinControls.UI.GridViewCellInfoCollection.get_Item(String name)
at Telerik.WinControls.UI.GridDataCellElement.UpdateInfoCore()
at Telerik.WinControls.UI.GridCellElement.UpdateInfo()
at Telerik.WinControls.UI.GridTableElement.UpdateCellContentByColumn(GridViewColumn column)
at Telerik.WinControls.UI.GridTableElement.UpdateViewCore(Object sender, DataViewChangedEventArgs args)
at Telerik.WinControls.UI.GridTableElement.UpdateView(Object sender, DataViewChangedEventArgs args)
at Telerik.WinControls.UI.GridTableElement.ProcessTemplateEvent(GridViewEvent eventData)
at Telerik.WinControls.UI.GridTableElement.Telerik.WinControls.UI.IGridViewEventListener.ProcessEvent(GridViewEvent eventData)
at Telerik.WinControls.UI.GridViewEventProcessEntity.ProcessCollection(GridViewEvent gridEvent, PriorityWeakReferenceList list, GridEventProcessMode processMode)
at Telerik.WinControls.UI.GridViewEventProcessEntity.ProcessEvent(GridViewEvent gridEvent)
at Telerik.WinControls.UI.GridViewSynchronizationService.NotifyListeners(GridViewEvent gridEvent)
at Telerik.WinControls.UI.GridViewSynchronizationService.FlushEvents()
at Telerik.WinControls.UI.GridViewSynchronizationService.DispatchEvent(GridViewEvent gridEvent)
at Telerik.WinControls.UI.GridViewSynchronizationService.DispatchEvent(GridViewTemplate template, GridViewEvent eventData, Boolean postUI)
at Telerik.WinControls.UI.GridViewSelfReferenceDataProvider.DispatchDataViewChangedEvent(DataViewChangedEventArgs args)
at Telerik.WinControls.UI.GridViewSelfReferenceDataProvider.Refresh()
at Telerik.WinControls.UI.GridViewTemplate.Telerik.WinControls.Data.IDataItemSource.Initialize()
at Telerik.WinControls.Data.RadListSource`1.Initialize()
at Telerik.WinControls.Data.RadListSource`1.Bind(Object dataSource, String dataMember)
at Telerik.WinControls.Data.RadListSource`1.set_DataSource(Object value)
at Telerik.WinControls.UI.GridViewTemplate.set_DataSource(Object value)
at Telerik.WinControls.UI.RadGridView.set_DataSource(Object value)
at AgroCenterCommunity.LawsForm.UpdateData() in C:\Documents and Settings\mxL\My Documents\Visual Studio 2008\Projects\ACK_01\ACK_01\LawsForm.cs:line 246
at AgroCenterCommunity.LawsForm.LawsForm_Load(Object sender, EventArgs e) in C:\Documents and Settings\mxL\My Documents\Visual Studio 2008\Projects\ACK_01\ACK_01\LawsForm.cs:line 221
at System.Windows.Forms.Form.OnLoad(EventArgs e)
at System.Windows.Forms.Form.OnCreateControl()
at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible)
at System.Windows.Forms.Control.CreateControl()
at System.Windows.Forms.Control.WmShowWindow(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
at System.Windows.Forms.ContainerControl.WndProc(Message& m)
at System.Windows.Forms.Form.WmShowWindow(Message& m)
at System.Windows.Forms.Form.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.IntCreateWindowEx(Int32 dwExStyle, String lpszClassName, String lpszWindowName, Int32 style, Int32 x, Int32 y, Int32 width, Int32 height, HandleRef hWndParent, HandleRef hMenu, HandleRef hInst, Object pvParam)
at System.Windows.Forms.UnsafeNativeMethods.CreateWindowEx(Int32 dwExStyle, String lpszClassName, String lpszWindowName, Int32 style, Int32 x, Int32 y, Int32 width, Int32 height, HandleRef hWndParent, HandleRef hMenu, HandleRef hInst, Object pvParam)
at System.Windows.Forms.NativeWindow.CreateHandle(CreateParams cp)
InnerException:

"string s" return a value, but then on next line VS2008 tell, that "Object reference not set to an instance of an object."

Need help.

insert
CategoryView.MasterTemplate.Reset();  before  DataTable source = CreateDataSource();
and have this:

System.Reflection.TargetInvocationException не обработано
Message="Exception has been thrown by the target of an invocation."
Source="mscorlib"
StackTrace:
at System.RuntimeMethodHandle._InvokeConstructor(Object[] args, SignatureStruct& signature, IntPtr declaringType)
at System.RuntimeMethodHandle.InvokeConstructor(Object[] args, SignatureStruct signature, RuntimeTypeHandle declaringType)
at System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
at System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
at Telerik.WinControls.UI.GridRowElement.CreateCell(GridViewColumn column)
at Telerik.WinControls.UI.GridDataRowElement.CreateCell(GridViewColumn column)
at Telerik.WinControls.UI.CellElementProvider.CreateElement(GridViewColumn data, Object context)
at Telerik.WinControls.UI.CellElementProvider.GetElement(GridViewColumn data, Object context)
at Telerik.WinControls.UI.BaseVirtualizedContainer`1.UpdateElement(Int32 position, T data)
at Telerik.WinControls.UI.BaseVirtualizedContainer`1.MeasureElements()
at Telerik.WinControls.UI.BaseVirtualizedContainer`1.MeasureOverride(SizeF availableSize)
at Telerik.WinControls.RadElement.MeasureCore(SizeF availableSize)
at Telerik.WinControls.RadElement.Measure(SizeF availableSize)
at Telerik.WinControls.UI.GridVirtualizedRowElement.MeasureElements(SizeF availableSize, SizeF clientSize, Padding borderThickness)
at Telerik.WinControls.UI.LightVisualElement.MeasureOverride(SizeF availableSize)
at Telerik.WinControls.UI.GridRowElement.MeasureOverride(SizeF availableSize)
at Telerik.WinControls.RadElement.MeasureCore(SizeF availableSize)
at Telerik.WinControls.RadElement.Measure(SizeF availableSize)
at Telerik.WinControls.UI.VirtualizedStackContainer`1.MeasureElementCore(RadElement element, SizeF availableSize)
at Telerik.WinControls.UI.ScrollableRowsContainerElement.MeasureElementCore(RadElement element, SizeF availableSize)
at Telerik.WinControls.UI.VirtualizedStackContainer`1.MeasureElement(IVirtualizedElement`1 element)
at Telerik.WinControls.UI.BaseVirtualizedContainer`1.MeasureElements()
at Telerik.WinControls.UI.BaseVirtualizedContainer`1.MeasureOverride(SizeF availableSize)
at Telerik.WinControls.UI.ScrollableRowsContainerElement.MeasureOverride(SizeF availableSize)
at Telerik.WinControls.RadElement.MeasureCore(SizeF availableSize)
at Telerik.WinControls.RadElement.Measure(SizeF availableSize)
at Telerik.WinControls.UI.RowsContainerElement.MeasureOverride(SizeF availableSize)
at Telerik.WinControls.RadElement.MeasureCore(SizeF availableSize)
at Telerik.WinControls.RadElement.Measure(SizeF availableSize)
at Telerik.WinControls.UI.ScrollViewElement`1.MeasureViewElement(SizeF availableSize)
at Telerik.WinControls.UI.ScrollViewElement`1.MeasureView(SizeF availableSize)
at Telerik.WinControls.UI.ScrollViewElement`1.MeasureOverride(SizeF availableSize)
at Telerik.WinControls.UI.GridTableElement.MeasureOverride(SizeF availableSize)
at Telerik.WinControls.RadElement.MeasureCore(SizeF availableSize)
at Telerik.WinControls.RadElement.Measure(SizeF availableSize)
at Telerik.WinControls.Layouts.DockLayoutPanel.MeasureOverride(SizeF constraint)
at Telerik.WinControls.RadElement.MeasureCore(SizeF availableSize)
at Telerik.WinControls.RadElement.Measure(SizeF availableSize)
at Telerik.WinControls.Layouts.ContextLayoutManager.UpdateLayout()
at Telerik.WinControls.RadElement.UpdateLayout()
at Telerik.WinControls.UI.GridVisibilityHelper.EnsureRowVisible(GridViewRowInfo rowInfo)
at Telerik.WinControls.UI.GridTableElement.EnsureRowVisible(GridViewRowInfo rowInfo)
at Telerik.WinControls.UI.GridTableElement.EnsureCellVisible(GridViewRowInfo rowInfo, GridViewColumn column)
at Telerik.WinControls.UI.GridTableElement.UpdateViewCore(Object sender, DataViewChangedEventArgs args)
at Telerik.WinControls.UI.GridTableElement.UpdateView(Object sender, DataViewChangedEventArgs args)
at Telerik.WinControls.UI.GridTableElement.ProcessTemplateEvent(GridViewEvent eventData)
at Telerik.WinControls.UI.GridTableElement.Telerik.WinControls.UI.IGridViewEventListener.ProcessEvent(GridViewEvent eventData)
at Telerik.WinControls.UI.GridViewEventProcessEntity.ProcessCollection(GridViewEvent gridEvent, PriorityWeakReferenceList list, GridEventProcessMode processMode)
at Telerik.WinControls.UI.GridViewEventProcessEntity.ProcessEvent(GridViewEvent gridEvent)
at Telerik.WinControls.UI.GridViewSynchronizationService.NotifyListeners(GridViewEvent gridEvent)
at Telerik.WinControls.UI.GridViewSynchronizationService.FlushEvents()
at Telerik.WinControls.UI.GridViewSynchronizationService.DispatchEvent(GridViewEvent gridEvent)
at Telerik.WinControls.UI.GridViewSynchronizationService.RaiseCurrentChanged(GridViewTemplate template, GridViewRowInfo row, GridViewColumn column, Boolean user)
at Telerik.WinControls.UI.GridViewTemplate.CollectionView_CurrentChanged(Object sender, EventArgs e)
at System.EventHandler.Invoke(Object sender, EventArgs e)
at Telerik.WinControls.Data.RadCollectionView`1.OnCurrentChanged(EventArgs args)
at Telerik.WinControls.Data.RadCollectionView`1.SetCurrentPositionCore(Int32 newPosition, Boolean forceNotify, CurrentChangeReason reason)
at Telerik.WinControls.Data.RadListSource`1.InitializeCurrentItem()
at Telerik.WinControls.Data.RadListSource`1.Initialize()
at Telerik.WinControls.Data.RadListSource`1.Bind(Object dataSource, String dataMember)
at Telerik.WinControls.Data.RadListSource`1.set_DataSource(Object value)
at Telerik.WinControls.UI.GridViewTemplate.set_DataSource(Object value)
at Telerik.WinControls.UI.RadGridView.set_DataSource(Object value)
at AgroCenterCommunity.LawsForm.UpdateData() in C:\Documents and Settings\mxL\My Documents\Visual Studio 2008\Projects\ACK_01\ACK_01\LawsForm.cs:line 245
at AgroCenterCommunity.LawsForm.UpdateButton_Click(Object sender, EventArgs e) in C:\Documents and Settings\mxL\My Documents\Visual Studio 2008\Projects\ACK_01\ACK_01\LawsForm.cs:line 676
at System.Windows.Forms.Control.OnClick(EventArgs e)
at Telerik.WinControls.RadControl.OnClick(EventArgs e)
at Telerik.WinControls.UI.RadButtonBase.buttonElement_Click(Object sender, EventArgs e)
at Telerik.WinControls.RadItem.OnClick(EventArgs e)
at Telerik.WinControls.UI.RadButtonItem.OnClick(EventArgs e)
at Telerik.WinControls.UI.RadButtonElement.OnClick(EventArgs e)
at Telerik.WinControls.RadItem.DoClick(EventArgs e)
at Telerik.WinControls.RadItem.RaiseBubbleEvent(RadElement sender, RoutedEventArgs args)
at Telerik.WinControls.RadElement.RaiseRoutedEvent(RadElement sender, RoutedEventArgs args)
at Telerik.WinControls.RadItem.RaiseBubbleEvent(RadElement sender, RoutedEventArgs args)
at Telerik.WinControls.RadElement.RaiseRoutedEvent(RadElement sender, RoutedEventArgs args)
at Telerik.WinControls.RadElement.DoMouseUp(MouseEventArgs e)
at Telerik.WinControls.ComponentInputBehavior.OnMouseUp(MouseEventArgs e)
at Telerik.WinControls.RadControl.OnMouseUp(MouseEventArgs e)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
at Telerik.WinControls.RadControl.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.Run(Form mainForm)
at AgroCenterCommunity.Program.SplashScreen() in C:\Documents and Settings\mxL\My Documents\Visual Studio 2008\Projects\ACK_01\ACK_01\Program.cs:line 41
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
InnerException: System.NullReferenceException
Message="Object reference not set to an instance of an object."
Source="AgroCenterCommunity"
StackTrace:
at AgroCenterCommunity.LawsForm.CategoryView_ViewCellFormatting(Object sender, CellFormattingEventArgs e) in C:\Documents and Settings\mxL\My Documents\Visual Studio 2008\Projects\ACK_01\ACK_01\LawsForm.cs:line 360
at Telerik.WinControls.UI.CellFormattingEventHandler.Invoke(Object sender, CellFormattingEventArgs e)
at Telerik.WinControls.UI.RadGridViewElement.OnViewCellFormatting(Object sender, CellFormattingEventArgs e)
at Telerik.WinControls.UI.GridDataCellElement.OnViewCellFormatting(CellFormattingEventArgs e)
at Telerik.WinControls.UI.GridCellElement.UpdateInfo()
at Telerik.WinControls.UI.GridVirtualizedCellElement.Initialize(GridViewColumn column, GridRowElement row)
at Telerik.WinControls.UI.GridDataCellElement..ctor(GridViewColumn column, GridRowElement row)
InnerException:

Sorry, wrong forum.

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Hello,
I have a RadGridView and I want to show summary of the column with some condition.
The data is as follow
____________________
name | price | discount
---------------------------------
name1 | price2 | discount2
---------------------------------
name2 | price3 | discount3
---------------------------------
name2 | price4 | discount4
---------------------------------
I want to my gird show summary something like this:
----------------------------------
total price of name1: price2  * discount2
total price of name2: (price3 * discount3) + (price4 + discount4)
----------------------------------
Grouping the name of name column to set the name of row summary, here is name1 and name2. In other hand, get the price and discount where name column to calculate total price. How can I customize this sum operation?

Please see attached files.

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I am trying to create a derived class which inherits from RadTextBox. My reason for doing this: I want to override the OnKeyDown event. The code compiles, but the event never fires. What am I missing? Here's my code:

    public class MyTextBox:RadTextBox

    {

        protected override void OnKeyDown(KeyEventArgs e)

        {

            if (e.KeyCode == Keys.F1)

                MessageBox.Show("test");

        }



    }