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Frequently Asked Questions

What is "ClickOnce"?

General - Windows Forms FAQs
quot;ClickOnce" is the codename for a technology that ships in the .NET Framework 2.0 that allows Windows Forms based client applications to be downloaded & run over the Network. Quite simply, "ClickOnce" makes running a client application...

Can I create a customizable "ClickOnce" application?

General - Windows Forms FAQs
For example, let's say you want to define an add-in model, or provide some base forms so my customers can extend to customize the look-and-feel of my app by just dropping in additional assemblies. How can you achieve this with "ClickOnce"...

Can I use "ClickOnce" to deploy an Office addin?

General - Windows Forms FAQs
No. Addins generally require special registration and integrated activation within the hosting application. The "ClickOnce" installer does not support machine level changes such as this.

Can I pass arguments to my "ClickOnce" application?

General - Windows Forms FAQs
Yes. When a "ClickOnce" application is activated via a URL, the application can obtain the QueryString of the URL used to activate the application.

What is the dfsvc.exe process that starts when I use "ClickOnce"?

General - Windows Forms FAQs
That is the actual "ClickOnce" engine that is handling the update checks & downloads. It is launched when a "ClickOnce" application needs updated. It shuts itself down if not used for 15 minutes.

Can I deploy managed C++ applications with "ClickOnce"?

General - Windows Forms FAQs
You can use "ClickOnce" to deploy .NET Framework based applications built with any language, including C++.

Can I use "ClickOnce" to deploy console apps?

General - Windows Forms FAQs
You can, but wouldn't you rather have a rich Windows Forms based UI? Also, console apps that require a command-line interface are beyond the scope of "ClickOnce" deployment in the .NET Framework 2.0. The primary reasons for this is that the install path...

Can "ClickOnce" applications be run when offline?

General - Windows Forms FAQs
Yes, "ClickOnce" applications that choose to be installed get an entry added in the Start Menu that can be used to launch the application when disconnected from the network. Note however, it's still up to the application to make sure it can work offline...

Is there something I should be doing now in my application to prepare for "ClickOnce"?

General - Windows Forms FAQs
Most applications won't have to know anything about "ClickOnce" to be deployed with "ClickOnce". In most cases, using "ClickOnce" is as simple as creating the necessary manifest files & placing the application on a server... for which we provide tools...

Do I have to have Visual Studio to use "ClickOnce"?

General - Windows Forms FAQs
No. While Visual Studio makes deploying "ClickOnce" applications simple, there are several other ways to deploy "ClickOnce" applications. The .NET Framework SDK includes a tool named MAGE(Manifest Editor & Generator) that provides both a UI (mageui...

Can I distribute my "ClickOnce" application via CD?

General - Windows Forms FAQs
Yes and your app will still be auto-updateable via a network server you configured into the "ClickOnce" deployment when you created the CDs. This is a great solution for large applications or for applications that have pre-requisites installed with the...

Can I install a "ClickOnce" application per-machine?

General - Windows Forms FAQs
No. All "ClickOnce" applications are installed per-user. Each user is totally isolated from one another and must install their own copy. If your application needs to be installed per-machine, you should use MSI.

How does MSI relate to "ClickOnce"?

General - Windows Forms FAQs
ClickOnce" & MSI are separate but, complimentary application installer technologies. "ClickOnce" is targeted at web based per-user deployments. This has a lot of benefits, but also means you can't do anything & everything at install time. If...

What types of applications can I deploy with "ClickOnce"?

General - Windows Forms FAQs
quot;ClickOnce" can be used to deploy Windows Forms based application based on the .NET Framework. Since "ClickOnce" applications are deployed via the web, they can't be allowed to impact the client machine to a high degree. So if...

What operating systems does "ClickOnce" support?

General - Windows Forms FAQs
ClickOnce" ships in the .NET Framework redist & supports all of the same operating systems & languages as the core .NET Framework. Specifically Windows 98 & up, except for NT4.

Can I use "ClickOnce" for Windows Forms Controls in the browser?

General - Windows Forms FAQs
No. "ClickOnce" only deals with deploying applications. The Windows Forms control in the browser technology is effectively unchanged.

How does "ClickOnce" relate to the V1 No-Touch deployment technology?

General - Windows Forms FAQs
ClickOnce" is the successor to the V1 No-Touch deployment technology. "ClickOnce" builds upon V1 & addresses the key limitations & issues with the V1 technology. The V1 No-Touch deployment technology is still supported in V2 of the .NET Framework...

Can I launch a "ClickOnce" app from any web browser besides Internet Explorer?

General - Windows Forms FAQs
quot;ClickOnce" simply uses a MIME type for activation, which is configured by the .NET Framework 2.0 setup. This allows a "ClickOnce" app to be launched by any client that uses standard Windows url activation. This includes Internet Explorer...

Are there any special server requirements for hosting a "ClickOnce" application?

General - Windows Forms FAQs
No. "ClickOnce" does not use any special protocols to transfer files. So you can use a regular file share, IIS or any web server. If you are using a web server, there are a few additional considerations. First, you may need to configure the...
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