I have a large set of data with which server-side paging is implemented.  I need to requery the data source any time the GridView's filter is changed by the user.  The problem lies in the fact that rebinding the DataSource inside any of the FilterChanged, FilterChanging, or FilterExpressionChanged events of the grid causes a null reference exception at the application level.

To work around this, I have found the following code which will correctly refresh the data source after a filter change has been finalized.


While the data source now refreshed automatically on a text change, it still did not refresh on a filter type change (ie. "Contains" to "Does not contain").  I tried calling RequeryGridData() in the closed event of the filter popup menu as follows.


This still caused a null reference exception.  I wondered what would happen if I delayed the datasource refresh until after the close event had finished and found myself with this code.


Which, as I suspected, works great.  No exceptions occurred.

My question is: Is there a cleaner way of detecting the filter change and performing a datasource change?  Perhaps this functionality is not the intended use of the GridView's filter controls, in which case I'll settle for the solution (read: hack) I've managed to come up with, but hopefully there is a better way to handle this.

Thank you for your time.

Dear Ivan Petrov

thanks a lot for your answer it was very useful, now I have an other problem, I want to change alignment to right, I searched and found a suggest, but it wasn't any useful for me, and I want to get color to get rectangle, but argb color's property is read only and I can't to do this and totally I want to change properties in the print for example : get page border, get alignment, get color, etc. but I can't do it.
would you can help me.
best regard.
Maryam

Hi
I used PropertyGrid . I defined item that is type of boolean and want to get value change and store this value in datatable 
i can't find property value in this event and don't know how to use GetValue(radProperty) .
How can do this ?

Hi,
Using a radtreeview with an access db with my data in a recursiv datatable, I would like to go through each element of the radtreeview to retrieve the displaymember and do some additional processes. Something like:
foreach(.... )
{
Parent -> go through each child of it -> if there are grandchildren-> go through each grandchild of child...
get_the_displayname_and_print_it()
.... do whatever...
}
and so on.
Can someone give me some support in this issue?
Thanks
Karl

 

 

Hi.
I used RadDropDownListEditor  in my gridview.when press tab Key and enter it,and start write with keyboard
i have a problem.but when enter this cell with Mouse I don't have any problem.
I used RadDropDownListEditor  in ver2011 and don't have any problem.
but now Use ver2012.this problem is exist.


private void GrdCheck_CellBeginEdit(object sender, GridViewCellCancelEventArgs e)

 

{

 

 

    if (GrdCheck.CurrentColumn is GridViewComboBoxColumn)

 

    {

 

 

        if (GrdCheck.CurrentColumn.Name.ToString() == "BankRef")

 

            {

 

 

            RadDropDownListEditor comboBoxEditor = this.GrdCheck.ActiveEditor as RadDropDownListEditor;

 

 

 

            if (comboBoxEditor != null)

 

            {

                comboBoxEditor.EditorElement.StretchVertically =

 

false;

 

                comboBoxEditor.DropDownStyle = Telerik.WinControls.

 

RadDropDownStyle.DropDownList;

 

                comboBoxEditor.DropDownSizingMode =

 

SizingMode.UpDownAndRightBottom;

 

            }
            }
    

 

}

 

}

 

 

 

private void GrdCheck_CellEditorInitialized(object sender, GridViewCellEventArgs e)

 

{

 

 

    if (GrdCheck.CurrentColumn.Name.ToString() == "BankRef")

 

    {

 

 

        RadDropDownListEditor cmb = GrdCheck.ActiveEditor as RadDropDownListEditor;

 

 

 

        if (cmb != null)

 

        {

            ((

 

RadDropDownListEditorElement)(cmb).EditorElement).DisplayMember = "Descr";

 

            ((

 

RadDropDownListEditorElement)(cmb).EditorElement).ValueMember = "Id";

 

　

            ((

 

RadDropDownListEditorElement)(cmb).EditorElement).DataSource =DtBankCheck;

 

            ((

 

RadDropDownListEditorElement)(cmb).EditorElement).SelectedIndex = -1;

 

            ((

 

RadDropDownListEditorElement)(cmb).EditorElement).ShowPopup();

 

        }

    }
}

Hi:

I found a way to disable wimform's close button on codeproject

http://www.codeproject.com/KB/cs/DisableClose.aspx

but it's not working  on R.A.D form (Q1 2009 SP1)  with vista theme.

can you provide a way to disable close button of R.A.D form?

thanks.

I am using a Web Method to fill a telerik combobox that is in a user control. (see http://demos.telerik.com/aspnet-ajax/combobox/examples/populatingwithdata/autocompletesql/defaultcs.aspx ).  I would like to put the Web Method code in the code behind for the user control rather than the mainpage code.   

<telerik:RadComboBox ID="RadComboBox4" runat="server" Width="250px" Height="150px"
                EmptyMessage="Select a Company" EnableLoadOnDemand="true" ShowMoreResultsBox="true"
                EnableVirtualScrolling="true">
                <WebServiceSettings Method="GetCompanyNames" Path="defaultcs.aspx" />
</telerik:RadComboBox>

So for the path, I would like to put: Path = "usercontrol1.ascx" rather than Path = "defaultcs.aspx", but it cannot find the web method.  Is it possible for a user control to call a web method that is in the code behind for the user control?

I am working on creating automated tests with CodedUI and I am having problems with the RadDropDownList. I can't verify the values that the RadDropDownList is set to. Whenever i try to verify the values CodedUI points to the a generic text box on the page. I am using version 2011.2.11.831. Even if I get a hold of the list the selected string value == null even when a value is selected.

I see that RadDropDownList is supports CodedUI so I wonder if I am doing something wrong or if there is a bug. Any help would be greatly appreciated. 

Sorry for the stupid question, I can not understand what is the control to use for make the navigation bar in the main form of your examples... see the link

http://imageshack.us/photo/my-images/51/navigationbar.jpg/

Good morning, I need to reload the radscheduler from the database, how I can do it? basically I need to reload as when you open for first time the form that contain the RadScheduler but without closing the form.
Thanks.