I have a web application which needs to create a spreadsheet and save it to disk. Here's what I have so far:

Imports Telerik.Web.Spreadsheet

Dim wb As New Workbook
Dim ws As New Worksheet
Dim r As Row

wb.Sheets = New List(Of Worksheet) From {ws}
ws.Rows = New List(Of Row)

r = New Row With {.Cells = New List(Of Cell)}
r.Cells.Add(New Cell With {.Value = "Spreadsheet Title", .FontSize = Convert.ToInt16(Unit.Point(12).Value)})
ws.Rows.Add(r)

r = New Row With {.Cells = New List(Of Cell)}
r.Cells.Add(New Cell With {.Value = Today.ToShortDateString, .TextAlign = TextAlign.Left})
ws.Rows.Add(r)

r = New Row With {.Cells = New List(Of Cell)}
r.Cells.Add(New Cell With {.Value = "Column Header"})

<more column headers>

ws.Rows.Add(r)

For Each dr As DataRow In ds.Tables(0).Rows
     r = New Row With {.Cells = New List(Of Cell)}
     If Not IsDBNull(dr("Field1")) Then r.Cells.Add(New Cell With {.Value = dr("Field1")})

     <more fields>

Next dr

ws.Rows.Add(r)

Dim strPath As String = My.Settings.DocPath & "ExcelReports\"
Dim strFileName As String = "Filename.xlsx"

wb.Save(New FileStream(strPath + strFileName, FileMode.Create), ".xlsx")

Problem: When the code gets to the Save statement, I get this error: "nullable object must have a value".

I don't know what this means. The strPath, strFileName and wb objects all have values, so I don't know what nullable object is being referenced.

Can anyone point out what I'm doing wrong? Or am I going about this whole thing the wrong way (entirely possible, since this is my first attempt at this)?

<INPUT onclick="javascript:setTimeout('window['Control_RadAjaxManager'].AsyncRequest(\'Control$ShareRadioButton\',\'\')', 0)" 

Code Snippet:
private void AddAjaxResponseScripts()
        {
            this.RadAjaxManager.ResponseScripts.Add("Sample.Controls.init(); if(Sample.QueryAddEdit) { Sample.AddEdit.init(); } ");
        }
Here Escape characters are not getting loaded properly .Missing  Escape characters in window['Control_RadAjaxManager'].
Current Version of Telerik 2015.3.1111.35 with .NetFramework 4.8.

Can anyone please help on this issue?

Hi, I am trying to provide visual indicators within the date input field of the data picker of possible errors with a date selection. I am trying to do this on keyboard input or the date picker date selection.

If the date selected or entered is before a date on the page, I want to show the error field in an error colour as that date could create program with other data being displayed. It is not a fatal error more a visual error. However, I do not see how this can be done because it appears that the date picker control is caching the initial classes and if you mouse over, that initial class over writes what is there and the visual error indication is lost. Alternately, if I try to set the inline styles with JQuery, they do not stick.

Basically, the concept is simple, put in a date before a displayed date, highlight the background of the input field. If the field is highlighted and you change the date to equal or be after the displayed, it goes back to the normal rendered state.

Am I basically SOL here?

The viewstate or application's pages are already encrypted but looking at the Burp output of the response from a POST to the Telerik.UI.DialogHandler (ImageMananger) it seems the Telerik view state in the response appears not to be.

We've generated and specified the DialogParametersEncryptionKey, ConfigurationEncryptionKey, and ConfigurationHashKey keys in the site level web.config as described in article https://docs.telerik.com/devtools/aspnet-ajax/controls/editor/functionality/dialogs/security. This didn't change the viewstate.
The machine key in IIS is set for auto-generation.
I'm only assuming the Telerik viewstate can be encrypted because what I've read seems to imply that, but I haven't found a clear example so I'm not sure.

i have excel file saved in SQL database as byte format, now i want to convert this bytes into excel and render it over RadSpreadsheet

Below is my code by getting exception "Value of type 'Telerik.Windows.Documents.Spreadsheet.FormatProviders.OpenXml.Xlsx.XlsxFormatProvider' cannot be converted to 'Telerik.Web.UI.SpreadsheetProviderBase'"

Please help

I have  a RadRadioButtonList on a ASP.Net page with 5 items in 3 columns.  With it set to 3 columns, the remaining 2 items go to another row which is what I would like to occur.  But what I am finding is that one of the remaining 2 items has text longer than the first item of the RadioButtonList which causes the columns to be misaligned.  Please see attached screenshot.  Note the column circled in red that is misaligned.

How do I get the columns to be aligned regardless of the length of the text?

Please help.  Thanks!

Sincerely,
Keith Jackson

Some of our users asked me if it is possible to format the html-code for better readability, some of the content was stored without newlines in the database and results in a pain to read in the html-mode when they need to make some minor changes. 

I'm not looking for something advanced more or less only some indentation and newlines.
Did not find anything useful when searching for this.. 

Hi all, I have a strange problem that I hope will have a simple solution.

I have a RadGrid in an asp.net webform.  This grid shows a list of reports that can be downloaded.

I have created a RadButtonColumn and set its CommandName to GetReport.

I am checking the ItemCommand event for this name and it is firing.

However the routine I am using to retrieve the PDF is not displaying the file for download.

If I put the same routine into a generic .net button, it fires without issue and acts as is expected.

See attached form structure and code behind.

and the code behind

What am I doing wrong here?  Why can I not seem to retrieve a file using the Gridviews buttonColumn?

Hello,

I have a legacy .NET web forms application with targetFramework 4.6.2.

I need to install Telerik.Web.UI  and Telerik.Web.UI.Skims.dll for this application. Please direct me from what location should I download the dll. I looked in Nuget but unable to find the dll

Thanks

Kapil