Hi All ,
I am getting the error "Object reference not set to an instance of an object." when trying to filter on gridview.
my functional requirement is to referesh grid data on every 5 seconds. I get this error when i keep open filter popup  above 5 seconds and trying to filter the data. However its working if i try to filter within 5 seconds.

 Please help to suggest .

The followings are the stacktrace details for your reference:

System.NullReferenceException was unhandled
  Message="Object reference not set to an instance of an object."
  Source="Telerik.WinControls.GridView"
  StackTrace:
       at Telerik.WinControls.UI.GridHeaderCellElement.filterPopup_FilterConfirmed(Object sender, EventArgs e)
       at Telerik.WinControls.UI.BaseFilterPopup.OnFilterConfirmed()
       at Telerik.WinControls.UI.RadListFilterPopup.OnButtonOkClick(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.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 Telerik.WinControls.RadControl.WndProc(Message& m)
       at Telerik.WinControls.UI.RadPopupControlBase.WndProc(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 Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()
       at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()
       at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine)
       at WindowsApplication2.My.MyApplication.Main(String[] Args) in 17d14f5c-a337-4978-8281-53493378c1071.vb:line 81
       at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException:

I have a GridView with a second-level hierarchy. I apply a filter to the BindingSource based on the node selected on a TreeView, for example: GridViewBindingSource.Filter = "Department = '" & e.Node.Text & "'". However, if any row is expanded (i.e. showing the second-level hierarchy information) it closes when the BindingSource is filtered. I would like to have any row that is open to remain open. Is there a way to do this?

Hi Telerik
is there a Property to change hover color for buttons (radButton , ToggleButton) in UI Element Editor
without using Visual Studio Builder

if not how to change hover color in Visual Studio Builder  in single button without changing all

thank you

Hi,

I am exporting the XAML RadDocument from the RichTextBox to use for my own Gdi+ rendering. To do this I need the text color as (A)RGB values, but especially when I am pasting webcontent into the RichTextBox I sometimes get color names (such as "red", "lime" and so on) as text color. Is there any way to make sure colors in the XAML are always ARGB values without having to convert them myself?

Thanks a lot for your help.

Regards
Jan

Hi,

I have applied custom filtering on the Treeview on Drop down selection change. Let's say I have applied filter to show only checked nodes and it did only showed me checked nodes. After filtering I unchecked one or more nodes but It didn't hide them so I figured that I might have to apply Filter on it again which I did but it didn't applied any filter nor did it go to the Filter Function that I have linked to it as well. Al thought it's working from UI.

Here's my code:

TreeView.TreeViewElement.FilterPredicate = FilterNode;


private bool FilterNode(RadTreeNode node)
 {
            bool filter = false;
            //Code 
            return filter;
 }

//For applying the filter

TreeView.Filter = string.Empty;
TreeView.Filter = "Custom";

Let me know if that makes any sense.

Thanks,
Attiqe

I know how to merge RadDocuments, but I'm trying to insert into a RadDocument which is acting as a template. How would I go about inserting the following XAML into a RadDocument?

<t:Paragraph FontSize="13.333333" LineSpacing="1" SpacingAfter="12"><t:Span FontFamily="Verdana" FontSize="13.333333" Text="Lorem ipsum dolor sit amet" /></t:Paragraph>

The above XAML comes from a RadRichTextBox and should be inserted into the RadDocument when exporting. It seems like the DocumentFragment class used to have this functionality (http://www.telerik.com/forums/loading-multiple-raddocuments-into-a-richtextbox), but it no longer takes in a Document in the constructor. It might be possible to do the above in an actual RichTextBox, but I'd like to do it using the RadDocument if possible.

I have 2 proposals for Step-by-step Tutorial – RadControls for WinForms.

1. On tutorial download page could be version number or last update date so we will not make unnecessary downloads to check if pdf or chm is updated.
2. It will be easier to read the pdf or help file if there are different version for C# and VB.

Hi, I followed your example for creating a basic radar chat as follows:


           RadarAreaSeries radarAreaSeries = new RadarAreaSeries("Sec1");
           radarAreaSeries.BackColor = Color.FromArgb(100, 142, 196, 65);
           radarAreaSeries.BorderColor = Color.FromArgb(100, 142, 196, 65);
           radarAreaSeries.DataPoints.Add(new CategoricalDataPoint(3.8d, "Oranges"));
           radarAreaSeries.DataPoints.Add(new CategoricalDataPoint(4d, "Bananas"));
           radarAreaSeries.DataPoints.Add(new CategoricalDataPoint(1.5d, "Apples"));
           this.EEGChart.Series.Add(radarAreaSeries);

           RadarAreaSeries radarAreaSeries2 = new RadarAreaSeries("Sec2");
           radarAreaSeries2.BackColor = Color.FromArgb(100, 27, 157, 222);
           radarAreaSeries2.BorderColor = Color.FromArgb(100, 27, 157, 222);
           radarAreaSeries2.DataPoints.Add(new CategoricalDataPoint(3.1d, "Oranges"));
           radarAreaSeries2.DataPoints.Add(new CategoricalDataPoint(1.8d, "Bananas"));
           radarAreaSeries2.DataPoints.Add(new CategoricalDataPoint(2.9d, "Apples"));
           this.EEGChart.Series.Add(radarAreaSeries2);

My question is if there exists another way to define the radar chart, by first defining the Categories, say Apple, Oranges etc and then creating the data series for each category. Having fixed the categories it would be much easieer to update data on the chart when values change, say every 1 sec.

We are using a RadGridView to display data in a small area, only two rows are visible at any given time with the third row partially visible.  Using the RowFormatting event handler, we set the forecolor to reflect rows that contain 'inactive' or 'invalid' records based on columns in the underlying data.  Generally this works fine.  But when there are more than three rows in the grid and some of those rows are not visible, the forecolor change is not reliable.  For example, if the first three rows are 'valid' and the fourth row is 'invalid', all appears correct when the grid is initially displayed and the user scrolls down to the fourth row.  The 'invalid' row has the forecolor changed to gray.  But when the fourth is selected and the user then scrolls back to the first row, the first row now shows as 'invalid' (forecolor = gray) even though the data has not changed and the other rows still display the same as before.  From that point on the first row displays incorrectly until the data is refreshed.  Sometimes this occurs even if the last row is not selected, just scrolling from top to bottom and back.

        private void grdEFT_RowFormatting(object sender, RowFormattingEventArgs e)
        {
                if (e != null &&
                    e.RowElement.RowInfo != null &&
                    e.RowElement.RowInfo.DataBoundItem is DataRowView)
                {
                    DataRow drEFT = ((DataRowView)e.RowElement.RowInfo.DataBoundItem).Row;
                    DataRow drAPM = drEFT.GetParentRow(this.rAutopayDS.Relations["AssociatePaymentMethodEFTPaymentMethodInfo"]);

                    if (drAPM != null)
                    {
                        // Show the row as inactive if it is not active.
                        if (!(bool)drAPM["Active"] ||
                            !(bool)drEFT["Valid"])
                        {
                            e.RowElement.ForeColor = System.Drawing.SystemColors.ControlDark;
                        }
                        else
                        {
                            e.RowElement.ResetValue(LightVisualElement.FontProperty, ValueResetFlags.Local);
                        }
                    }
                    else
                    {
                        e.RowElement.ResetValue(LightVisualElement.FontProperty, ValueResetFlags.Local);
                    }
                }
        }

Thanks,
Greg Swope

Hi
Is there a way to hide or grey out sections of the Scheduler time to prevent appointments being made?

Sort of out of Office type periods or when a resource is not available?

This sort of does things, but it gets a bit messy on the Day and Timeslot overlap.  I watned to try and get a Day to be grayed out.  Sort of if someone was on leave then the day is greyed out entirely like the Saturday and Sunday are.  But I seem to have some bug in the way it is working because the Wednesday keeps being open.

Here is the code so far