Questions on UI for WinForms Forum

1 answer

148 views

Performance when navigating using keyboard

Hello,

I have an unbound grid with 30 columns and not more than few hundred rows. When the application is in full screen mode (grid takes almost whole screen), the grid is reacting quite slow. When using keyboard to navigate it takes up to 2 seconds to move to next cell even on a relatively fast PC (Intel Core 2 Duo, 1,86 Ghz, 2 GB RAM). It happens only when navigating left/right, up/down works fine. I noticed that when going into edit mode then all visible rows are refreshed, then when leaving edit mode visible rows are refreshed, and finally when the focus moves to another column all visible cells are refreshed. There is quite a lot of cells to refresh and that seems to be causing the slowdowns. Is there any way to make the grid respond faster to keyboard actions (refresh only the affected cells/columns/rows) ?
I'm using Telerik Controls for WinForms (.net 2.0), tried it on 2008 Q3 SP2 and the newest demo 2009.2 729 (Jul 29, 2009)

Thanks in advance

GridView

answered on 31 Aug 2009

1 answer

158 views

Rebinding a TreeView

I have a private instance of a collection of business objects on a form. On form load, I fill the collection with data and bind it to a treeview. In reaction to user input elsewhere on the form, I add and remove items from the collection. At that point I need to refresh the binding of the TreeView. I tried resetting the DataSource property and I've tried the Refresh and Update methods, but nothing I do makes the TreeView display the new data.

How do I do this?

Treeview

answered on 31 Aug 2009

1 answer

174 views

CellDoubleClick Problem

I seem to have a small problem with the CellDoubleClick event with the GridView. It seems that when I doubleclick anywhere in the header for each of the rows it processes the event. How can a prevent this from happening? Can the header for the GridView be disabled so that when a user doubleclicks any header it won't fire the event?

Thanks

GridView

answered on 31 Aug 2009

3 answers

179 views

Rad Hierarchy Grid view

How to add image column in master grid?

GridView

answered on 31 Aug 2009

1 answer

325 views

gridview image datasource problem!!!

Hi,

Recently i have faced a problem, which surely i think u guys will hae a solution.

Scenario:

I have a gridview, a picture box and a sql database.

Procedure:

Basically, its a client information entry form which takes in data from a user and stores it in a database and then recalls it in a gridview for administrative purposes.

The userclickes the picture box and gets a picture through a fileopendialog box, which is then converted into a byte array. i have made a client class which takes in all the client information using get/set properties, the image datatype is still unsure (need a little help on that too), then there is a stored procedure written which takes this class parameters and writes them to a database.

on the administrative side a connection is made to the sql server and a reader method is used which returns all the objects in the database and generates a list based on the client class. the class is then fed directly to the gridview as a datasource.

Problems:

Firstly there are no columns defined in gridview, it just takes the returned class and populates on that basis. probelm is with the image column. can u please guide me on storing image from picture box to the database and then retreiving into the gridview.

do i need to define all columns before populating it, and/or add a image column in it. Urgent help is required please.

PictureBox image convertsto byte array.

Sql database table has a field named 'ClientImage" of datatype 'image'

SqlReader method retrieves an object only, so one has to convert back to image

display this image with other info in gridview.

can u please help me on all these datatypes and how to show image in gridiew. it would be more helpful if i dont have to specify any columns in gridview, and directly populate from datasource.

Thanks in advance!!!!

GridView

answered on 28 Aug 2009

1 answer

200 views

Undo-Redo nodes move

Hi,

I would like to know if you have an easy way to implement Undo-Redo on all node action (Moving, deleting, adding, rename, drag and drop from one control to another, etc...)?

The only way I found is to save all the control structure in xml temp file after each change but this way is absolutely not efficient... I would like to know if there is a better and faster way.

Thanks in advance for your help.

Best regards,

Fred

Treeview

answered on 28 Aug 2009

2 answers

950 views

foreach statement to search listbox items

Hi,

I am encountering a problem with searching radlistbox items. MyCode:

                    private void searchListBox(object sender, EventArgs e)         
                    {         
                        int count = 0;         
                        foreach (RadListBoxItem item in this.lbLiveClients)         
                        {         
                            if(item.DescriptionText == this.txtFindLiveClient.Text)         
                            {         
                                this.lbLiveClients.SelectedIndex = count;         
                                break;         
                            }         
                            count++;         
                        }         
                    }         

gives an error:

foreach statement cannot operate on variables of type 'Telerik.WinControls.UI.RadListBox' because 'Telerik.WinControls.UI.RadListBox' does not contain a public definition for 'GetEnumerator'.

Any Solution to this:

I have items that have both text and description text. I wanted to search description text for some reason. then i decided on simple for loop.

                                for (int i = 0; i < this.lbLiveClients.Items.Count; i++)         
                        {          
                            this.lbLiveClients.Items[i].         
                        }         

but no description text property there for items there, only the text property.

Any Solution to any of this.??
Thanks in advance

ComboBox and ListBox (obsolete as of Q2 2010)

answered on 28 Aug 2009

3 answers

516 views

RadGridView for WinForms - Hide Row Indicator

Is there a property I am missing to hide the Row Indicator? This occupies a lot of space that I would rather not have.

Thanks

GridView

answered on 27 Aug 2009

4 answers

312 views

Rad Grid view Hierarchy

How to Handle Inner (Child)Grid events in Rad Grid view Hierarchy (Win Forms)

How to set Inner (Child)Grid Heigh in Rad Grid View Hierarchy (Win Forms).

GridView

answered on 27 Aug 2009

5 answers

643 views

[Solved] RadToggleButton User vs. Programatic StateChanged Event

I have a RadGridView that is being used to edit data. Some of the cells contain bold text.

I am attempting to add a RadToggleButton that will be used to bold or unbold text. When the user selects a row with bold text, I toggle the RadToggleButton to ON. When the user selects a row not formatted with bold text, I toggle the RadToggleButton to OFF.

I need to handle the ToggleStateChanged event differently when the button is clicked than when I toggle the state programatically.

Any suggestions on how to do this?

Buttons, RadioButton, CheckBox, etc

answered on 27 Aug 2009