I need to subtract two date from dateTimeColumns.

I tried in the designer:
DATEDIFFDAY(Periodo, Data_Pagam), in the designer

I tried with the code:

 radGridView1.Columns["Ritardo"].Expression = "Periodo-Data_Pagam";

I keep getting this error:
Invalid Expression:
"Cannot perform '-' operation on System.DateTime and System.DateTime

Please help.

I was looking at the Q2 2013 WinForms Controls demo. In the demo I liked the 'DOCK MDI Parent Form' sample. Where Can I download the sample code for this project?

See attached screen print.

Thanks

Hi
i am working asp.net project with c# and i want to print the report or show as PDF to the client. report have Two parameters.
can any body help me in this how to do it.

Thanks

Is it possible to set a combobox column to null?  I currently have the following shell of code:

private void RadGV_Records_KeyDown(object sender, KeyEventArgs e)
        {
            if (RadGV_Records.CurrentColumn.GetType().ToString() == "Telerik.WinControls.UI.GridViewComboBoxColumn")
            {
                if (e.KeyCode == Keys.Delete)
                {
                   
                    
                }
            }
        }

Inside the "if (e.KeyCode == Keys.Delete)", I want to set the current combobox value to null or empty, like it is before the user selects anything from the box.

I will be really glad if I can get some direction on this:
I have a radGridView in a winform in which I have also 4 decimal columns of which 1 (Balance) is calculated with an expression (Balance=Paid-Due+Expenses). All columns are bound to an sql table.
Id-----Date------Due-----Paid-----Expenses-----Balance

How can I generate a new empty row just below the active row if the value of balance is different than 0?
The problems I have are:
-how to get the value contained in "Balance" of the active row
-how to add a row below the active row

Thanks a lot,
Felice
 

How do I fix up all the references to Telerik in the courseware solution?   When I build the Getting Started project under Buttons, I get the following errors.  When I expand the references branch in the project all the Telerik references have yellow exclamation points.   Do I need to fix up all the references manually?

FYI, I'm a long time C++ developer who is transitioning to c# so I'm not too familiar with visual studio and C#.

Thanks,



1>------ Build started: Project: GettingStarted (Courseware\Calendar\CS\GettingStarted), Configuration: Debug Any CPU ------
1>C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets(1605,5): warning MSB3245: Could not resolve this reference. Could not locate the assembly "Telerik.WinControls, Version=2011.2.11.712, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL". Check to make sure the assembly exists on disk. If this reference is required by your code, you may get compilation errors.
1>C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets(1605,5): warning MSB3245: Could not resolve this reference. Could not locate the assembly "Telerik.WinControls.Themes.Aqua, Version=2011.2.11.712, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL". Check to make sure the assembly exists on disk. If this reference is required by your code, you may get compilation errors.
1>C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets(1605,5): warning MSB3245: Could not resolve this reference. Could not locate the assembly "Telerik.WinControls.UI, Version=2011.2.11.712, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL". Check to make sure the assembly exists on disk. If this reference is required by your code, you may get compilation errors.
1>C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets(1605,5): warning MSB3245: Could not resolve this reference. Could not locate the assembly "TelerikCommon, Version=2011.2.11.712, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL". Check to make sure the assembly exists on disk. If this reference is required by your code, you may get compilation errors.
1>C:\Telerik\Courseware\Courseware\Calendar\CS\GettingStarted\GettingStarted\RadForm1.cs(8,7,8,14): error CS0246: The type or namespace name 'Telerik' could not be found (are you missing a using directive or an assembly reference?)
1>C:\Telerik\Courseware\Courseware\Calendar\CS\GettingStarted\GettingStarted\RadForm1.cs(9,7,9,14): error CS0246: The type or namespace name 'Telerik' could not be found (are you missing a using directive or an assembly reference?)
1>C:\Telerik\Courseware\Courseware\Calendar\CS\GettingStarted\GettingStarted\RadForm1.cs(13,37,13,44): error CS0246: The type or namespace name 'RadForm' could not be found (are you missing a using directive or an assembly reference?)
1>C:\Telerik\Courseware\Courseware\Calendar\CS\GettingStarted\GettingStarted\RadForm1.Designer.cs(112,17,112,24): error CS0246: The type or namespace name 'Telerik' could not be found (are you missing a using directive or an assembly reference?)
1>C:\Telerik\Courseware\Courseware\Calendar\CS\GettingStarted\GettingStarted\RadForm1.Designer.cs(113,17,113,24): error CS0246: The type or namespace name 'Telerik' could not be found (are you missing a using directive or an assembly reference?)
1>C:\Telerik\Courseware\Courseware\Calendar\CS\GettingStarted\GettingStarted\RadForm1.Designer.cs(114,17,114,24): error CS0246: The type or namespace name 'Telerik' could not be found (are you missing a using directive or an assembly reference?)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========


Thanks,

I have a GridView with around 6k rows in it.  When I click the column header to sort the rows, some columns are fast (a second or two) and some are very slow (45 seconds or so).  it looks like the difference is that the slow ones only have a tiny number of distinct values in them.  For example my "Name" column is mostly unique per row, and it sorts in a couple second, but my "Excluded" column only shows "No" or "Yes" (about 98% "No" and 2% "Yes") and it takes 45 seconds to sort by. 

It looks like the problem is that your sort algorithm does not deal with this problem scenario well due to almost all the items being identical.  My profiler shows that with the Name column most of the time from HybridIndex.PerformQuickSort is in List.BinarySearch and that GridViewRowInfoComparer.Compare only gets called about 100k times.  But with the "Excluded" column most of the time is in GridViewRowInfoComparer.Compare which is called a whopping 17M times.

I don't think this data scenario is uncommon, so I think there should be some way to handle this.  If I could tell this column to use a different sort algorithm that would be fine. 

I have set use mnemonic property of LiveTile to true and use ampersand(&) for making the letter mnemonic but its not working.

Help...

Hi
How can I change the image of center circle in clock, which is in LightVisualElement in hierarchy?

What I mean is, if you pay attention to clock, there is little circle in center of clock, which is an image.

Thanks