Questions on UI for WinForms Forum

1 answer

174 views

Binding Dataset with Filter causes Problems

Hi,

In the code below I have a dataset connected to a radTreeView. It is recursive and it works. When I try to filter the dataset with the .Select command the radTreeView knows there is data there but the displaymember stays blank - meaning no text in the tree. Why?

Thanks,
Karl

private void BindLangDataToTree()

{

this.radTreeView1.DisplayMember = "Thema_" + myLang; ;

this.radTreeView1.ParentMember = "pid";

this.radTreeView1.ChildMember = "id";

this.radTreeView1.ValueMember = "id";

radTreeView1.DataSource = ds_Baum.Tables["Baum"];//.Select("Schule='" + mySchuleID + "'");

}

Treeview

answered on 13 Jun 2012

3 answers

220 views

[Solved] GridViewComboBoxColumn DBNull issue

Hi,

I have a ComboBoxColumn that is bound to a datatable. One of the options in the datatable is "None" with a value of DBNull. I have the DisplayMember and ValueMember set and everything works just fine, except when I choose "None" in the list and move off the row. The column with the ComboBox is empty instead of "None". Any other value displays the lookup text just fine.

Any ideas?

GridView

answered on 13 Jun 2012

1 answer

439 views

RadGridView initialization delay

Hi,
Could I make RadGridView control's initialization faster? Currently first initialization of this control can take few seconds, what is quite long in case of dialog window, appearing on demand.

Sample code:

public partial class RadGridViewDialog : Form

{

private RadGridView _grid;

public RadGridViewDialog()

{

InitializeComponent();

}

private void btnInitialize_Click(object sender, EventArgs e)

{

_grid = new RadGridView();

panel2.Controls.Add(_grid);

_grid.Dock = DockStyle.Fill;

_grid.BringToFront();

}

private void btnBuild_Click(object sender, EventArgs e)

{

using (_grid.DeferRefresh())

{

GridViewDataColumn firstColumn = new GridViewTextBoxColumn();

firstColumn.HeaderText = "Name";

_grid.Columns.Add(firstColumn);

firstColumn.ReadOnly = true;

GridViewDataRowInfo[] rows = new GridViewDataRowInfo[200];

GridViewDataColumn secondColumn = new GridViewTextBoxColumn();

secondColumn.HeaderText = "Value";

_grid.Columns.Add(secondColumn);

secondColumn.Width = 110;

secondColumn.MinWidth = 70;

int rowIndex = 0;

for (int i = 0; i < rows.Length; i++)

{

rows[rowIndex] = new GridViewDataRowInfo(_grid.MasterView);

rows[rowIndex].Cells[0].Value = "name" + i;

rows[rowIndex].Cells[1].Value = "value" + i;

rowIndex++;

}

firstColumn.IsPinned = true;

_grid.Rows.AddRange(rows);

firstColumn.BestFit();

}

After first opening this form, when user clicks on btnInitialize button application is freezing for few seconds, clicking on btnBuild button is much faster. Second and next clicks on btnInitialize (no matter in the same or other dialog in the same application) are faster too.

I've noticed that it's a reason of calling:
Telerik.WinControls.Themes.ControlDefault.ExternalControlsThemeHelper.LoadGridThemes()
in the static constructor of class Telerik.WinControls.UI.RadGridViewElement.

Is it possible to speed up first initialization of this class?

Regards

GridView

answered on 13 Jun 2012

3 answers

113 views

[Solved] Upgrading from Q1 to Q2 (2 versions in system now)

Hi,

This is the first time I'm installing new releases from Telerik. Previously i'm using Q1 controls, now with the release of Q2 controls, I just download it from my account and install it. But when I go to Control Panel, i see both Q1 and Q2 controls being installed, is that normal? Or do I need to uninstall Q1 product?

Thank you.

Regards,
Jenson

General Discussions

answered on 12 Jun 2012

5 answers

260 views

[Solved] default selected index?

My gridview automatically expands a group when accessed that is in the middle of the grid so it forces the user to collapse the group and then scroll to the top of the grid. When I ungroup the data, the grid will just select a row. I basically need nothing to be expanded or selected by default but I do not see (or can not find) any options or documentation on solving this.

Edit: So it seems that it is selecting the first row from my database if this helps any.

Thanks,
Kyle

GridView

answered on 12 Jun 2012

8 answers

661 views

Custom row edit in gridview

Hi! I'm new to Telerik controls. I have radgridview control with "Edit" commandcolumn. When I click "Edit" button I want to show/open panel (or other container) with full of primitive controls (such as dropdownlist, textbox, radiobutton etc.) just below row that must be edited. After data entering in the panel i want to click "Save button" (in the panel or elsewhere) and row updated with new values. Is it possible to do it with radgridview? In asp.net ajax Q1 controls there is a NestedViewTemplate that you can insert to RadGrid element. Is there a similiar way in WinForm RadGridView? I am using Q2 Winform controls, Visual Studio 2008, C# prgramming language.
Thanks

GridView

answered on 12 Jun 2012

5 answers

195 views

[Solved] RadControls for WinForms Original Theme

Hello,
Can i use your original theme ? and edit it ?
if yes please tell me where i can find Theme File .. what i have to do ...
Thank you

Carousel

answered on 12 Jun 2012

4 answers

431 views

CommandBarTextBox Width

How do I set the width of a CommandBarTextBox control? It appears to reset itself to 60 of I change Size or Bounds in the designer, and if I set AutoSize to false all of the controls get mashed together and the layout looks atrocious. What am I missing?

Thanks.

CommandBar

answered on 12 Jun 2012

1 answer

134 views

[Solved] Carousel control animation is inconsistent or broken

I have just upgraded the carousel control with latest version (2012.2.608.40), After upgrading the animation of the control is broken. i.e. in 2 of 5 times items do not move correctly along the path and end up on random spots within the control. I am using this control as a theme selector so when the selectedIndex is changed it also switch the theme while doing the animation.

P.S Animation may be conflicting with theme switching but it was working OK before. I have attached 2 screenshot of what a normal layout should be and one that is screwed up.

Please help.

Carousel

answered on 12 Jun 2012

3 answers

289 views

[Solved] issue with cellPaint-event

Hello!

I have a issue with the cellPaint-Event (virtualmodus is off).
In the Event I call a method where I draw the Background and the text of a cell. If the first cell of the current row has a special Tag, then I want to draw the text across all columns.
Therefore I use the bounds-Property of the RowElement.
But instead of drawing the text from the first cell across all other columns, the text is drawn within each cell. Why does this happen?
I explicitly set the Graphics.Clip to the Bounds of the RowElement.

See attached image for the issue.
There is also another issue where the background is drawn "behind" the scrollbar.

Just by the way: Can I set a ColumnSpan for a specific cell?

Here is my code for painting the cell:

private void drawTitle(GridViewCellPaintEventArgs e)

{

var groupText = grid.Rows[e.Cell.RowIndex].Cells[0].Tag as string;

var font = new Font(SystemFonts.MessageBoxFont, FontStyle.Regular | FontStyle.Underline);

//region to draw is the entire row

e.Graphics.Clip = new System.Drawing.Region(e.Cell.RowElement.Bounds);

e.Graphics.Clear(Color.PeachPuff);

e.Graphics.DrawString(groupText, font, Brushes.Blue, Point.Empty);

e.Cell.RowElement.DrawBorder = false;

e.Cell.RowElement.BorderWidth = 0;

e.Cell.DisableHTMLRendering = true;

e.Cell.CanFocus = false;