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The values for a widget's Identity "Name" and "Class" that a user may enter using the Properties window should only allow for valid file names, class names and property names.
For example if you enter today "1Foo" in the "Class" field, you get no warning by the Properties window that this value is invalid and you should change it.
The designer will allow this "1Foo" value to be entered and will end up generating code (a class in this case) that won't compile.
Visual Studio users are used to get an error dialog as soon as their enter an invalid value for a property value. This is usually implemented by using TypeConverters that check the entered data.
On entering "1Foo" in the "Class" field, no warning is shown by the Properties window that this value is invalid.
Xamarin 18.104.22.168 (09870684ffab6d8697b491503867808b567b4021)
*** Bug 33129 has been marked as a duplicate of this bug. ***
In a derivative form of this, I was able to create a Class with a line break in it. Originally, it happened from some sort of delay with the Designer reloading, but you can reproduce it by copying text with line breaks from a text editor into the Class property field.
Xamarin Studio successfully created files with line breaks in them on the Mac. If the line break is at the end of the class name, even the generated C# file is valid. (If not, you split the class name and it won't build as above.) When that resulting project is loaded on Visual Studio, it will crash when you try to see the files in the Solution Explorer.