<p>Is there any way to set the same icon to all my forms without having to change one by one?
Something like when you setup <code>GlobalAssemblyInfo</code> for all your projects inside your solution.</p>

One option would be to inherit from a common base-Form that sets the Icon in the constructor (presumably from a resx). Another option might be
PostSharp
- it seems like it should be possible to do this (set .Icon) via AOP; not trivial, though. Finally, you could use a simple utility method (perhaps an extension method) to do the same.
Best of all, with the first option, you could probably risk a
Ctrl
+
H
(replace all) from
```
: Form
```
or
```
: System.Windows.Forms.Form
```
to
```
: MyCustomForm
```
.