Questions on UI for WinForms Forum

1 answer

258 views

Node in TriState mode get wrong CheckState.

I use Telerik Version=2011.3.11.1219 and try use TreeView control with TriStateMode.

Question 1: Also I want to prevent checking node due some conditions - for example, if node.ImageKey ="class_grey" (some picture from imagelist container).

Private Sub RadTreeView1_NodeCheckedChanging(ByVal sender As Object, ByVal e As Telerik.WinControls.UI.RadTreeViewCancelEventArgs) Handles RadTreeView1.NodeCheckedChanging

If Not e.Node.Checked AndAlso e.Node.ImageKey = "class_grey" Then

e.Cancel = True

End If

End Sub

If I make that tree:

and try to check node "Node1" - I get this situation:

But it is obviously wrong! Nodes "Node1" and "Node8" have wrong state mode ("On" instead of "Indeterminate")
It should be like that (which I got if uncheck/check node "Node9"):

How can I fix that?

Question 2: How can I change view of checkbox in TriState mode? For example, I would like to change view for "Indeterminate" mode from filled green box to red tick.

Treeview

answered on 21 May 2012

1 answer

138 views

Grouping child entities in grid view

Hi there -

I'm new to Entity Framework and still working my way through the gridview control. I'm not sure where to put this question, so I figured I would start here.

I have an entity framework (EF) with a header-detail model. When I perform the linq query with an include, I want to display the sub entities (the details) in the grid. Would be even nicer if I group group by the details (all in one grid).

So my questions may be, how do I write/use the linq query to bring back the headers and group the details within the same grid. Here is what I have so far:

Private Sub loadLotDetails(PO_Number As String)

Dim query = From l In context.Lot_Header.Include("Lot_Detail")

Where l.Lot_Number = PO_Number And l.Lot_Process_Status <> "90"

Select l

lotDetailsGridView.DataSource = query

End Sub

I appreciate any information or direction possible.

Thanks
Bob

GridView

answered on 21 May 2012

4 answers

579 views

ObjectContext instance has been disposed using EF 4.0

OK - So I'm still new to all this EF and Telerik stuff. However after doing research I'm sure it's not a Telerik control issue. In any case, I thought I would start here for help.
I have a simple Entity relationship (Lot_head and Lot_Detail)

When I execut the following code:

Private Sub btnSearchPO_Click(sender As System.Object, e As System.EventArgs) Handles btnSearchPO.Click

LotDetailsDataGrid.DataSource = getLotDetails(PurchaseOrderTextBox.Text)

End Sub

Private Function getLotDetails(lotNumber As Integer) As List(Of Lot_Detail)

Using context As New Three_Way_MatchEntities

Dim lot = (From ld In context.Lot_Detail

Where (ld.Lot_Number = lotNumber)

Select ld).ToList

Return lot

End Using

End Function

The grid populates the data correctly, however when I scroll to the end of a row, it throws the "The ObjectContext instance has been disposed and can no longer be used for operations that require a connection." exception.

Now I understand that since I am using lazing loading and using the 'Using' statement, the context has been disposed. I'm also assuming that the datagrid must rely on having that context left open. As many have mentioned you should keep the context open for only as long as you need it. If that's the case, how would you write this example?

Thanks for the help!
Bob

GridView

answered on 21 May 2012

2 answers

249 views

[Solved] DropDownList Shape RoundRect c#

Hi there,

I am writing to you to understand if you could help me as to the following.

Currently I am developing an application and I am exploiting RAD WinControls in C#.

In one form I have a few text boxes with the TextBoxElement.Shape set to RoundRect.

I would need to do the same in a couple of dropdown lists and in one datetime picker.

Therefore I am trying to set the related properties in the same way:

e.g. ddlDropDown.DropDownListElement.Shape = new Telerik.WinControls.RoundRectShape();

Yet in this case the displayed items show some white angles (see attachment)

Would you please help me to understand how to fix that, i.e. how to delete or hide the white angles?

Thanks in advance for your kind collaboration

Best regards

Davide

DropDownList

answered on 18 May 2012

1 answer

173 views

RadLabel Size is 0

Is there any way to get the RadLabel size when it is created via runtime?

I am trying to calculate the height of a container control by summing the height properties of the controls added to the container.

When create a new object instance of a RadLabel in code such as this:

Dim p_Label as New RadLabel

. . the width and height properties are set to 0 and remain at zero even after setting the text property.

I was looking for some type of Resize method that could be called after setting the .Text and .Font property, but have been unable to find such a way to cause the control to recalculate its size.

A point of clarification: after adding the RadLabel to a container the height property is always 1, which is not really the case.

Label

answered on 17 May 2012

1 answer

136 views

Next and previous buttons on RadRotator

I see the next and previous buttons on left side of RadRotator during design-time, but not at runtime. How do I display these buttons?

Rotator

answered on 17 May 2012

12 answers

490 views

Valid values are between 1318 and 1450, inclusive. Parameter name: year

Hi Dear,

Please tell me what i did wrong?

I just drag rad calender into rad tab control and assign culture = "Arabic Saudi arabia"

I am not able to assign
I am getting below message
(Valid values are between 1318 and 1450, inclusive.
Parameter name: year)

your immediate reply will be appreciated

Thanks & Regards,

Calendar, DateTimePicker, TimePicker and Clock

answered on 17 May 2012

1 answer

278 views

Sorting by DateTime

Has anyone managed to sort a listview by a date rather than having the column taken to be a string?

I can't see a date specific entry so i'm currently using

ShareMessageListView.Columns.Add(new Telerik.WinControls.UI.ListViewDetailColumn("Date"));

This may be my problem.

ListView

answered on 17 May 2012

3 answers

112 views

[Solved] Hierarchy. Child expanded

Is it possible under Auto Hierarchy, to make a child expanded? Don't like press +

found by myself:

radgridview1.Rows[0].IsExpanded = true;

GridView

answered on 17 May 2012

5 answers

329 views

[Solved] Custom Cell displaying Multi-column list

I need to show a multi-column list within a gridview cell (read-only). I've read the documentation on creating custom cells but can't figure out which element to use in my custom cell. If anyone has any sample code or could simply advise which RadElement to use, I would really appreciate it.

GridView

answered on 17 May 2012