Questions on UI for WinForms Forum

25 answers

1.1K+ views

[Solved] Change cells custom control based on value from a columns dropdown

Hi,

In my grid i have two columns. The first column are binded to a list of custom datatypes.
A custom datatype can be: DataTime, number or list of strings.
The second column should be of the type that the first column selected value is on the same row.

So if the selected value in the first column is DateTime, then the second column (ON THIS ROW) should show a DataTimePicker.
If the selected value in the first column is a "list of strings", then i have to lookup the value in the database and present the second column (ON THE SAME ROW) with a list of strings in a combobox and so on.

1. Is there any way to do this?
2. How do i get the bounded item from the combobox in the first column?

/ST

GridView

answered on 11 Nov 2010

1 answer

221 views

Regarding Combobox column in Radgridview

Hi,
I would like to add a combobox column in RadGridview and I have added it. Now the Problem is how to add items into those comboboxcells dynamically and also when i would like to display the related information in nearby texboxcell in radgridview depending upon the users selection. Please provide immediate attention...

Thanking You

Regards

Zeno..

GridView

answered on 11 Nov 2010

4 answers

147 views

[Solved] more than 3 Y-axies chart

I need to create a chart with more than three Y-axies as my attach file show.
Is there any way to create this kind of chart?

Chart (obsolete as of Q1 2013)

answered on 11 Nov 2010

10 answers

795 views

[Solved] Memory Usage: Where's the problem in my code?

Hi,

I'm currently evaluating different grids. For a current project we need a grid which can display up to some 100.000 rows. Currently I'm testing with a file which is 50 MB in size and has almost 500.000 lines. Of course this is a case where the virtual mode is required. For comparision I have made a small app, which reads in the file and displays them in a grid. First version is just the normal way adding the lines to a datatable and binding it to the grid.

StreamReader sr = new StreamReader(Application.StartupPath + "\\Data\\beispieldaten2010_50mb.csv", Encoding.Default);

DataTable dt = new DataTable();

dt.Columns.Add("Spalte 1");

...

dt.Columns.Add("Spalte 14");

while (!sr.EndOfStream)

{

dt.Rows.Add(sr.ReadLine().Split(new char[] {';'}));

}

radGridView1.DataSource = dt;

Start this app and after almost 5 seconds the grid is filled with data. Memory usage at this moment approx 370 MB. Now the virtual mode where the memory usage is expected to be much lower isn't it?

StreamReader sr = new StreamReader(Application.StartupPath + "\\Data\\beispieldaten2010_50mb.csv", Encoding.Default);

ArrayList al = new ArrayList();

while (!sr.EndOfStream)

{

al.Add(sr.ReadLine().Split(new char[] { ';' }));

}

radGridView1.VirtualMode = true;

radGridView1.CellValueNeeded += new Telerik.WinControls.UI.GridViewCellValueEventHandler(radGridView1_CellValueNeeded);

radGridView1.ColumnCount = 14;

this.radGridView1.RowCount = al.Count;

And the event handler code is here:

void radGridView1_CellValueNeeded(object sender, Telerik.WinControls.UI.GridViewCellValueEventArgs e)

{

string[] c = (string[])al[e.RowIndex];

e.Value = c[e.ColumnIndex];

}

Starting thgis app it takes 5 seconds and the memory usage is surprisingly at 370 MB. So there seems not to be any change. What have I done / unterstood wrong? Setting a breakpoint to the eventhandler shows, that this part of code is unreachable and seems not to be called. So where comes then the data from?

Thanks for your help,
Michael

GridView

answered on 10 Nov 2010

4 answers

171 views

[Solved] Designer issue, I'm stuck

I have a radWinform application with a radmenu and a radpageview. Menu is docked to the top and pageview is docked to fill. Now I want to add a radToolStrip, in between the menu and the pageview. If I change the pageview to dock none, add the toolstrip and dock to top, then change the pageview to fill, it underlays the toolstrip. If I cut the pageview before adding the toolstrip, I get two errors saying Object reference not set to an instance of an object. I then paste it back and the docking is fine, however my two radSplitPanels that were on one of the pageviewpages are gone. Is there an easy way to accomplish this without rebuilding my form?

Thanks, Steve

General Discussions

answered on 10 Nov 2010

9 answers

448 views

ToggleState should not obsolete IsChecked

Is there a compelling reason to obsolete the IsChecked property of Check Boxes and Radio Buttons?
For what it's worth, the .Net checkbox has both a Checked (boolean) and CheckState property, I thought this was an established standard. Why mess with it?

Personally, I have rarely (I think never) had a reason to use a three-state control. It's neat and different, and a way to clearly indicate an unset value, but I haven't had a reason to utilize an indeterminate state.
However, I've implemented and used thousands upon thousands of checkboxes, and a simple boolean setting has so far always made the most sense.
I would be very sad to have to change nearly 400 lines of code from a clean, easy to understand

    
            checkbox.IsChecked = true;

To the unwieldy

    
            checkbox.ToggleState =   
        
            SomeCompany.ControlNamespace.SubNamespace.SomeEnumeration.On;

Worse still, many of these are directly connected to a simple on-off value somewhere. So I'd be going from:

    
            checkbox.IsChecked = LightSwitch.SwitchedOn;

To the even more gangly

    
            if (LightSwitch.SwitchedOn)  
        
              checkbox.ToggleState = SomeCompany.ControlNamespace.SubNamespace.SomeEnumeration.On;  
        
            else 
        
              checkbox.ToggleState = SomeCompany.ControlNamespace.SubNamespace.SomeEnumeration.Off;

Am I the only one who feels the boolean property needs to be retained?

Buttons, RadioButton, CheckBox, etc

answered on 10 Nov 2010

7 answers

698 views

[Solved] Display image in gridview header

Hi

I am using radgrid in visual studio 2008 .i want to display image in grid header on left side when i click that imagebutton popup should show

so can anyone help how to display image in gridview header

regards
suresh.s

GridView

answered on 10 Nov 2010

1 answer

125 views

not compatible error with 2010.3

I'm going to open a ticket on this, but wanted to share my resolution first.. I just downloaded the 2010 Q3 release (build 1109) and received a version not compatible, check whether you need an x86 or x64 version of the program. Running Windows 7 x64 version. All other Q3 installers worked fine. This one though, is the only installer that was an .exe. All others are .msi files. Renamed the extension to .msi and it installs without error.

Cheers.

General Discussions

answered on 10 Nov 2010

4 answers

431 views

[Solved] How does work EnableFastScrolling ?

Hi

I have some performance issue in gridview and I would like to try use property EnableFastScrolling.

What happens if fast scrolling in enabled? Why it is not enabled by default?

I checked documentation: http://www.telerik.com/help/winforms/telerik.wincontrols.gridview-telerik.wincontrols.ui.radgridview-enablefastscrolling.html but there are no any details.

Regards

GridView

answered on 10 Nov 2010

3 answers

545 views

[Solved] radRadioButton - Binding IsChecked

Hi,

I have a custom class which is bindable. Lets assume I got the following two properties
public bool X
{
    get {...}
    set {...}
}

public bool Y
{
    get {...}
    set {...}
}

The X and Y properties are mutually exclusive (i.e. X && Y is always false and X || Y is always true)

I have a user control that contains two different groups. In each group I have a radio button (from the Rad UI Controls).
The constructor of the user control binds the property "IsChecked" of the two radio buttons to the property X and to the property Y respectively. For some reason, whenever a radio button is pressed, the setter of the property is not called. This seems to me as a bug since when I put two radio buttons from the .NET library (the regular radio buttons) they work fine.

I was trying to find a utility to fill a bug report but couldn't find it.

Please let me know if this is a known issue.

Thanks

Buttons, RadioButton, CheckBox, etc

answered on 10 Nov 2010