Questions on UI for ASP.NET AJAX Forum

42 answers

8.4K+ views

This sticky thread lists known issues and breaking changes introduced in the UI for ASP.NET AJAX releases.

Q3 2011 (Version number: 2011.3.1115)

Problem: When adding items to OData-enabled controls (RadMenu, RadTreeView, RadListBox, RadComboBox) through design time erroneous markup is applied to the control:

<telerik:RadListBox runat="server" ID="RadListBox1">
    <Items>
    </Items>
    <WebServiceSettings>
        <ODataSettings InitialContainerName="">
        </ODataSettings>
    </WebServiceSettings>
</telerik:RadListBox>

Please note the added ODataSettings section. It will cause JavaScript errors on the page.

Solution: Remove the ODataSetting section and the issue will vanish. The problem is also fixed in the Q3 SP1 release, version number 2011.3.1305

General Discussions

updated answer on 17 Feb 2025

1 answer

720 views

I'm getting an error with Telerik

When I run my project I'm getting this error

Could not load file or assembly 'Telerik.Web.UI' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

In my web.config I checked that the version in the web.config is the same as the version I'm using in references

General Discussions

answered on 22 Oct 2021

0 answers

7 views

RadCalendar not showing localized month names in picker

Calendar

updated question on 03 Apr 2025

0 answers

7 views

Slow loading web forms with RadGrid

Yesterday, April 1st, around 2:35PM Eastern, several of my web forms became extremely slow/non-responsive for a period of about 5 minutes or so. This also happened on March 14th. Since it happened so quickly, I could only do limited troubleshooting, but it seems like any of our forms that has a Radgrid became slow. One of our forms has been in use since last winter and has not been changed since last last year. Only a few hundred records exist in that database.

I tried to open the web forms in Edge, instead of Chrome, and sometimes the form would initially open. When I closed out and went back in, the form would become non-responsive. I have menus on my forms and those always loaded, but the grid did not. And then after a few minutes, everything started to work fine again.

We checked IIS and the memory seemed fine at the time of the slowness. We checked the error logs at that time of failure and did not see anything either. It was a bit tough to troubleshoot as it was relatively brief both times it happened.

Has anyone else complained about this? Maybe a recent patch could be behind this? I'm not sure what to think/try.

Ajax

Grid

asked on 02 Apr 2025

1 answer

6 views

Rad Image Gallery thumbnail broken

I use telerik web ui 2024.1.131.45 in my asp net web app. Using Rad Image Gallery the thumbnail is not showing (see attached). Any idea why?

Thanks before

ImageGallery

answered on 02 Apr 2025

0 answers

11 views

WebForms PdfViewer Updating Fillable PDF

HI Guys

I was wondering if you WebForms PdfViewer can accomplish updating fillable PDF and save the data entries into a new PDF, explain

I have a fillable PDF with a few fillable textboxes, and I would like to capture the user inputs and save as a new PDF for then later continue filling the blanks loading the new saved PDF.

I've tried accomplishing the task using iTextSharp but it was not possible here is my code for reference.

string existingPdfilePath = Server.MapPath("~/export/I-693_1000_202502191951256806.pdf");
 string updatedPdfPath = Server.MapPath("~/App_Data/I-693_" + Guid.NewGuid().ToString() + ".pdf");

 using (FileStream pdfReaderStream = new FileStream(existingPdfilePath, FileMode.Open, FileAccess.Read))
            {
                using (FileStream pdfWriterStream = new FileStream(updatedPdfPath, FileMode.Create, FileAccess.Write))
                {
                    PdfReader reader = new PdfReader(pdfReaderStream);
                    PdfStamper stamper = new PdfStamper(reader, pdfWriterStream);

                    AcroFields formFields = stamper.AcroFields;
                    foreach (DictionaryEntry de in reader.AcroFields.Fields)
                    {
                        //sb.Append(de.Key.ToString() + Environment.NewLine);
                        var fullname = formFields.GetTranslatedFieldName(de.Key.ToString());
                        formFields.RenameField(fullname, Guid.NewGuid().ToString("N"));
                        if (de.Key.ToString() != fullname)
                            if (!String.IsNullOrEmpty(de.Value.ToString()))
                            {
                                if (fullname != "form1[0].#pageSet[0].Page1[9].PDF417BarCode2[0]")
                                {
                                    formFields.SetField(de.Key.ToString(), de.Value.ToString());
                                }
                            }
                    }
                    stamper.Close();
                    reader.Close();
                }

As a PDFViewer I am using the plain html embed tag

 <embed class="pdf" 
               src=
"~/Templates/I-693_100_2025045512.pdf"
            width="800" height="500" />

The user data entries vanish like a ghost, and when saving it just make a copy of the original with no captured data entries

Can your PDFViewer accomplish the task?

PdfViewer

UI for ASP.NET AJAX in ASP.NET MVC

updated question on 01 Apr 2025

1 answer

10 views

Filter on different column to users selection

I am using Visual Studio 2019 c#

I have a telerik radgrid which has a column named StageStDate which is in string format but shows a date in format dd-mmm-yy. This column has filtering enabled with a date picker.

I have a hidden column named StageStartDate which is a replicate of StageStDate but is a date column and in format DD/MM/YYYY.

As StageStDate wont filter correctly as its a string format, when user select a date for this column from filter I would like the filtering to apply to the StageStartDate column, how can I achieve this please?

On ItemCommand I have changed the Pair Second to StageStartDate instead of StageStDate

but for some reason this makes the filterExpression blank.

Filter

Grid

answered on 31 Mar 2025

1 answer

20 views

RadDateTimePicker calendar shadow problem

Hi there,

I am currently trying to figure out a problem with the display of the calendar in the ASP AJAX RadDateTimePicker control. It seems like the bottom shadow of the calendar is either offset or the calendar is a little too short and causes a gap between the calendar pane and the shadow.

Even after stripping away ALL possible conflicting CSS, the above image is still what we get. I am using a standard RadDateTimePicker control without any embellishments. Literally, just:

<telerik:RadDateTimePicker ID="myID" runat="server"></telerik:RadDateTimePicker>

Has anyone seen this issue before?

Cheers

Gareth

Calendar

answered on 28 Mar 2025

1 answer

9 views

How to Add an Alert in the FileStore Method in Telerik File Explorer?

I'm trying to add a alert inside the FileStore method in Telerik's File Explorer, but it's not working as expected. Here's my implementation:

public override string StoreFile(UploadedFile file, string path, string name, params string[] arguments)
{
string physicalPath = this.GetPhysicalFromVirtualPath(path);
if (physicalPath == null)
return string.Empty;

Directory.CreateDirectory(physicalPath);

// sanitize the file name
name = (name.Replace(" ", "_")).Replace("'", string.Empty);
physicalPath = PathHelper.AddEndingSlash(physicalPath, '\\') + name;

string fileName = Path.GetFileName(physicalPath);
string folderPath = Path.GetDirectoryName(physicalPath);

FileStorageManager fileStorageManager = new FileStorageManager();
FileStorageInformation fileInfo = fileStorageManager.GetFileByFolderAndFileName(_applicationID, folderPath, fileName);

string fileFolderRelativeToRoot = path;
string rootToThisContext = path;
string message = null;

if (File.Exists(physicalPath))
{
bool isVersioningDisabledOnDestination = false;
UploadingHandler uploadingHandler = new UploadingHandler();
uploadingHandler.ExecuteAction(fileInfo, fileName, fileFolderRelativeToRoot, rootToThisContext, _applicationID, _formID, _userID, ref isVersioningDisabledOnDestination);

if (isVersioningDisabledOnDestination)
{
message = string.Format("Can not upload - versioning not enabled on target folder");
}
}

if(message == null)
{
file.SaveAs(physicalPath);

return PathHelper.AddEndingSlash(path, '/') + name;
}
else
{
return message;
}
}

FileExplorer

answered on 28 Mar 2025

1 answer

14 views

RadTreeView causing vulnerability scanner to say that is is vulnerable to cross site scripting

Hello,

I was notified that one of the sites I developed is returning a vulnerability to cross site scripting. I have already tried many ways to correct this issue with code and content security policy changes. I still can't get rid of this vulnerability. We are using Progress® Telerik® UI for ASP.NET AJAX runtime version: v4.0.30319 version: 2020.1.114.45. Can I download the trail of asp.net ajax and try that version of the treeview and see if that corrects the issue?

Issue Detail

The value of the scrollPosition JSON parameter within the ctl00_ContentPlaceHolder1_VIndex2_tvIndex_ClientState parameter is copied into the HTML document as plain text between tags. The payload sbi7s<script>alert(1)</script>tx52l was submitted in the scrollPosition JSON parameter within the ctl00_ContentPlaceHolder1_VIndex2_tvIndex_ClientState parameter. This input was echoed unmodified in the application's response.

Request

older1_VIndex2_tvIndex_ClientState=%7b%22expandedNodes%22%3a[]%2c%22collapsedNodes%22%3a[]%2c%22logEntries%22%3a[]%2c%22selectedNodes%22%3a[]%2c%22checkedNodes%22%3a[]%2c%22scrollPosition%22%3a%220**sbi7s%3cscript%3ealert(1)%3c%5c%2fscript%3etx52l**%22%7d&ctl00_RadWindowManager1_ClientState=&__ASYNCPOST=true&ctl00%24ContentPlaceHolder1%24VIndex2%24btnAddCart=Add%20To%20Cart

Response

> HTTP/2 200 OK
> Cache-Control: no-cache
> Pragma: no-cache
> Content-Type: text/plain; charset=utf-8
> Expires: -1
> Server: Microsoft-IIS/10.0
> X-Powered-By: ASP.NET
> X-Frame-Options: SAMEORIGIN
> X-Ua-Compatible: IE=edge,IE=11,IE=10,IE=9,IE=8,IE=7
> Strict-Transport-Security: max-age=31536000
> Date: Wed, 19 Mar 2025 16:26:27 GMT
> Content-Length: 82
> 68|error|500|0**sbi7s<script>alert(1)</script>tx52l** is not a valid value for Int32.|