I followed this tutorial, but when I build then run my project in visual studio a ribbon tab does not appear. I'm using outlook 2010 if that helps.

I would like to use c# to convert a doc file to docx file. Can this be done without Word on a server?

When you have more than one Excel file open, and your VBA/VSTO code calls the Calculate function, or turns on Automatic Calculation, Excel will painfully recalculate all open Workbooks, not just th...

I have an Excel VSTO add-in, which updates every 24 hours via ClickOnce. This works fine. I would like to provide a button where the user can manually check for an update, immediately. I followed ...

I have Developed VSTO Addin. Now When I am trying to Install VSTO Addin in my machine I am getting an Exception as following. System.Xml.XmlException: '<', hexadecimal value 0x3C, is an invalid...

I cannot find any documentation, if VSTO AddIns are supported by SDK-style projects. I already installed and used h. van brakels project2015to2017.migrate2019.tool. The resulting project files are ...

I am getting HRESULT: 0x800A03EC on Worksheet.range method. Number of rows are more than 70K. Office 2007. Code: Microsoft.Office.Interop.Excel.Range neededRange = currentWS.Range[cell.Cells[1, ...

I am working with Window Service project. that have to write data to a sheet in Excel file in a sequence times. But sometimes, just sometimes, the service throw out the exception "Exception from H...

I have an exiting VSTO add-in but I want to add a new report that would be SO MUCH BETTER as a little web browser control pop up. Would be ideal to use the Office js api for that. Would also help r...

I need users to click the "Trust access to the VBA project object model" so that an app I'm building can help them import code to the VBE. I could display a messagebox or provide documentation te...

I was having some trouble getting unit testing with xUnit to work in Visual Studio (2019) for my VSTO Outlook addin project. I had reviewed the following SO questions and answers: VSTO Unit Testing...

How can I alter the row heights of all my non empty rows in my EXCEL sheet? Thanks in advance, w.

Is there a standard way to access a C# (or VB.NET) library from an Office 365 Web Add-In? I have a very large VSTO Word Add-In with a substantial amount of code written in C#, so I need to know if ...

I set the value of my keytip attribute for a split button to be "CKS" but when I execute the add-on in Outlook 2010, I get the hint that it's accessible using "Y7". I'm guessing it's some default t...

Afer deploying my VSTO add-in with ClickOnce, I get the following error message when trying to launch setup.exe: File, Addin.resources.dll, has a different computed hash than specified in manife...

I have generated a series of rows using C# and VSTO. I have basically loaded a couple of rows with data and have given each cell a NamedRange. My question is how would I, knowing the beginning row ...

I've got a strange issue with a Word VSTO add-in on one machine where running the visual studio project opens word but does not attempt to start the add in as far as I can tell. I got to this poin...

In Visual Studio VSTO, how can I specify the document to open each time I run the project to debug it? By default, it always opens a blank document and of course I want to test against features th...

I had developed a system that deals with excel sheets in 2006 using MS VS 2005. Now, I can not use the same reference with MS VS 2012. var app = new Microsoft.Office.Interop.Excel.Application(); W...

I have the following ribbon.xml in my word vsto add-in: <tab id="TabLetters" getVisible="IsLettersTabVisible" label="Letters"> <group id="LettersGroup" label="Letters"> <toggleBut...

Background I have the following scenario: MailItemProxy class with a constructor with a single argument of type MailItem (MailItem is actually part of the Microsoft.Office.Interop.Outlook namesp...

First of all, thank you for your time and assistance in reviewing this!... I'm trying to upgrade an Excel VBA workbook to a VSTO Excel Add-in in VB.NET using VS 2010. In the original (i.e.- VBA) v...

Release an HelloWorld add-in for Ms Word. Sign and publish via ClickOnce, with the installation folder being set to an online directory. Routine to follow Run the add-in setup.exe to install via...

I work on a VSTO in c#. When I click on button I save attachment in a folder. My problem is : when I have a rich email with an image in the signature, I have a element in my attachment. But I don't...

I have an excel XLS developed with Visual Studio Tools For Office (VSTO) 2005. Most of the code is in C# VSTO, but there is also a VBA macro to implement a worksheet function. I'm not trying to hav...