Questions on UI for WinForms Forum

9 answers

540 views

Gridview performance with grouping very slow

Hey there, having a performance issue when grouping is enabled. I do not believe it is the grouping logic, but perhaps a drawing issue. I have about 1800 items of 10 columns that are sorted and grouped (about 12 groups). When grouping is off, it runs very fast. With grouping on, it is painfully slow reacting to commands and changes in the bindinglist. However... if I keep most groups collapsed it runs fast again, which is what leads me to believe it may be redrawing (formatting, etc.) rows that are not visible to the user.

For now I will default the groups to collapsed, but would love some feedback on handling this performance issue when all groups are opened. I can only imagine a user with 5000+ items.

Thanks!

GridView

answered on 10 Jan 2011

5 answers

176 views

[Solved] issues with ribbonbar and form theme

I had a radform with breeze extended theme. The I added a ribbonbar and it asked me to activate the radribbonbarform behaviour. But it told me that if i deleted the control it would reverse the automatically.

Now, I deleted the ribbonbar but the theme in the form and in all the other controls don't show the style ("breeze extended"). What can i do about it?

thanks a lot

RibbonBar

answered on 10 Jan 2011

8 answers

171 views

Sort descriptors not working after upgrading to 2010.3 SP1

Hi there.

A few days ago, I upgraded from version 2010.3.1109 of the Windows Forms controls to version 2010.3.1215 (SP1). This was done to fix an issue with the RadButton.

However, now my sort descriptors I have added to a RadGridView are not being respected. Below is the code I am using which was working before the upgrade.

private void sortGrid()

{

int sortOrder = byBradFordRadioButton.ToggleState == Telerik.WinControls.Enumerations.ToggleState.On ? 0 : 1;

dataGrid.SortDescriptors.Clear();

if ( sortOrder == 0 )

{

dataGrid.SortDescriptors.Add(new SortDescriptor("Bradford Factor", ListSortDirection.Descending));

// select the first row

dataGrid.setSelectedRowIndex(0);

}

else

{

dataGrid.SortDescriptors.Add(new SortDescriptor("Employee", ListSortDirection.Ascending));

}

Any clues on a workaround for this?

GridView

answered on 10 Jan 2011

1 answer

120 views

Docking Event

hi team,

After this event what is the next sequence of events fired.

serviceDragDrop.PreviewDockPosition += new DragDropDockPositionEventHandler(serviceDragDrop_PreviewDockPosition);

For me the active document changed event does not fire sometime.

Thanks
suresh.

Dock

answered on 10 Jan 2011

3 answers

118 views

[Solved] Add RadWaitingBar to RadStatusStrip Q3 2009

Hi,
I am using a trail version.

I try to add a WaitingBar to a StatusStrip. I use following code to archive this :

   waitingBar = new RadWaitingBar();
   waitingBar.BeginInit();
   Size waitingBarSize = new Size(this.radLabelElement2.Size.Width, this.radLabelElement2.Size.Height);
   waitingBar.MinimumSize = waitingBarSize;
   waitingBar.MaximumSize = waitingBarSize;
   waitingBar.EndInit();
   host = new RadHostItem(waitingBar);
   this.radLabelElement2.Margin = new Padding(0);
   this.radLabelElement2.Children.Add(host);

I just add a radLabel to the StatusStrip named radLabelElement2 and it worked but the appearence look a little bit strange :

http://h-4.abload.de/img/unbenannt1oi3.png

I use the Desert Theme but the WaitingBar got a white border. I want is transparant. How can I archive this ?

Thanks

StatusStrip

answered on 10 Jan 2011

2 answers

163 views

Upgraded Gridview version Problem

Hi,

I was using Q22009 version of Telerik control before in my project and everything was working fine. Few days back I downloaded latest version and replaced my existing refrences of telerik with new refrences .i.e. 2010.3.10.1109. All other controls are working fine but I am getting errors in gridview controls. I used new gridview in another sample project and observed that there is much difference in properties of old gridview and new gridview.

I used new and it was working fine also but as I said there are changes. So what I gues from this, I have to change all my grids now. But I have so many grids in my project and it require lot of time to change them now. I wanna to ask that is there any short way to make this chage.

Please recommmend me the easy and good solution to upgrades my controls with the latest version of Telerik.

Regards,

Ahmed Almousa

GridView

answered on 10 Jan 2011

9 answers

806 views

Multi-Column Listbox

The standard listbox supports multicolumn. Is this soemthing the RadListbox will support?

ComboBox and ListBox (obsolete as of Q2 2010)

answered on 10 Jan 2011

1 answer

531 views

[Solved] how to select value from multicolumn combobox??

Hi there....

I tried to select value from editor control then pass that to a textbox...
i'm already tried this from documentation:

Dim test As String

test = String.Format("Row changed, current Name = {0}", RadMultiColumnComboBox1.EditorControl.Rows(RadMultiColumnComboBox1.SelectedIndex).Cells("ContactName").Value)

textbox1.text = test

that code return me an error like this:

"Object reference not set to an instance of an object."

What should i do??

MultiColumn ComboBox

answered on 10 Jan 2011

5 answers

216 views

Problem with Grid / rows position

Hello, I've got a problem with the grid position
In some specific case, the rows position in the RadGridView are too high.
So when the scroll bar is at the top, you are missing some rows
And when you are at the bottom, you have empty space.

So this happen when I call BeginUpdate(); EndUpdate(); while I'm scrolling.
And only scrolling with the left click (no wheel)
Use the sample code and left clic on the scrollbar, go all the way down, and Voila.
Everything go back to normal if you use the wheel all the way to the Top. But it's not acceptable for our user

const int CST_AUTO_EXPAND_START = 15; //Last %

bool m_alreadyScroll = false;

public Form1()

{

InitializeComponent();

}

private void AddDatas()

{

List<string> datas = new List<string>();

for (int i = 0; i < 50; i++)

{

datas.Add("string" + i.ToString());

}

radGridView1.DataSource = datas;

}

public void ExpandPage()

{

m_alreadyScroll = true;

radGridView1.BeginUpdate();

//Normally I would update my datasource here threw a background worker

radGridView1.EndUpdate();

}

private void Form1_Load(object sender, EventArgs e)

{

radGridView1.GridElement.VScrollBar.ValueChanged += new EventHandler(VScrollBar_ValueChanged);

AddDatas();

}

void VScrollBar_ValueChanged(object sender, EventArgs e)

{

if (m_alreadyScroll)

return;

Telerik.WinControls.UI.RadScrollBarElement scrollBar = (Telerik.WinControls.UI.RadScrollBarElement)sender;

int maxValue = scrollBar.Maximum - scrollBar.LargeChange;

//if the scroll bar is in the bottom zone, we search for new data

if (maxValue - maxValue * CST_AUTO_EXPAND_START / 100 < scrollBar.Value)

ExpandPage();

}

GridView

answered on 10 Jan 2011

7 answers

244 views

[Solved] Selected row changing unexpectedly

I am finding that if you have a sort on a colum and you edit that value so that it change position in the grid, that sometimes when you tab out of that field a completely different row is selected, and you are now editing the wrong cell.

I have been able to reproduce the behavior on the demo application - Gridview - Populate with data - select Dataset, sort by Postal Code

Its doesnt happen every time on the demo, but it does on my application (Q3 2010)

ALastair

GridView

answered on 10 Jan 2011