.NET Bugs Registry

because you are not the only one bitten by that bug

This page represents a registry of known .NET bugs. You can use it to see if the strange thing you are seeing is a known bug, or to report a new bug that you just found.

Known .NET Bugs

ID	Description	Probability*	Severity*	Fixed
1	Form refuses to close If a form A contains control B that contains control C that contains control D, and D is removed while it has the focus, the user won't be able to close the form. Details.	High	High	1.1
2	SoapFormatter and BinaryFormatter don't serialize some object graphs properly If three or more classes have the same name but are in different namespaces, are part of the same hierarchy, and contain variables that have the same name, they will not be serialized properly. Details.	Low	High	1.1
3	Text in the Windows Forms combo box cannot be selected using the mouse Mouse selection simply does not work in a Windows Forms combo box. Details.	High	Low	1.1
4	Arrays of structures that implement ISerializable do not deserialize correctly Details.	High	High	1.1
5	Windows.Identity doesn't work under Windows 98 On Windows 98, You cannot use the Windows.Identity to retrieve the user login name, it returns a system level token and a null user name is returned when you access the .Name Property. Details.	Low	Medium	No
6	C# optimizer produces bad code when a try-finally block is inside if-else If a try-finally block is the last thing inside the if block of an if-else statement, the code inside the else block is always executed when compiling in Release mode. Details.	High	High	1.1
7	Structs within structs cannot be deserialized If you have a struct A inside struct B, and If a struct A is inside struct B which is inside object C, deserializing is going to throw a SerializationException. Details.	Medium	Low	1.1
8	Problems removing an ActiveX control from its parent If an ActiveX control is removed from its parent, any action that makes the parent invisible, such as closing the form on which it is on, throws an exception. Details.	Medium	High	1.1
9	Font.GdiCharSet hardcoded to 1 The property GdiCharSet of the font class is hard-coded to 1. Details.	Low	Low	No
10	.NET Runtime leaks large chunks of memory If you allocate a block of memory larger than some treshold, the .NET garbage collector will never reclaim it. Details.	High	High	1.1
11	Instances of NumericUpDown and DomainUpDown are leaked It seems that the NumericUpDown and DomainUpDown controls forget to remove a listener to a global event, thus always staying locked in memory. Details.	High	High	No
12	SoapFormatter chokes on some strings It seems SoapFormatter cannot handle strings that contain characters in the range 0x01 - 0x1f. Details.	High	High	No
13	FileStream becomes unusable when writing to a removable drive When writing to a FileStream on a removable drive, and the FileStream gets out of space, it sometimes gets in a state where no other method can be called on the stream, not even Dispose. Details.	Medium	Medium	No
14	Mixed-mode assemblies can deadlock C++ .NET apps can deadlock on startup. Details.	Low	High	No
15	ComboBox Data Binding Bug ComboBox doesn't update the data through data binding when its style is set to DropDownList. Details.	Medium	Medium	No
16	Each Windows Form leaks two GDI handles Details.	High	High	No
17	Alocation fails for certain sizes If you try to allocate an array with a size range between 0x027fefbd and 0x027fffec, the framework throws exceptions. This range corresponds to memory block of little under 40MB. Details.	Medium	High	No
18	No way to access Environment.HasShutDownStarted This property is not static even though it should be.	Low	Low	1.1
19	Thread.Abort cannot abort suspended threads If a thread is suspended, trying to abort will not work and the CPU will be pegged to 100 percent. Details.	Low	High	No
20	Control.Width and Height are silently truncated to 32,767 If you attempt to set a control's Width or Height property to a number larger than 32,767 it will be truncated. Details.	Low	Low	No
21	ListView.Cursor set property has no effect. Details.	Low	Low	No
22	RegistryKey.SetValue does not store large integers as DWORD Call RegistryKey.SetValue with an integer over 2,147,483,647 will result in the value being stored as string, and not as a DWORD. Details.	Low	Medium	No
23	Panel doesn't repaint when parent Panel is disabled If you have a Panel inside a Panel, and the parent Panel gets disabled, the child panel won't repaint. Details.	Low	Low	No

* Probability represents the probability that you will encounter this bug. Severity measures how much the bug hurts when it happens.

How to Report a New Bug

To report a bug that's not on the above list, please e-mail me with the following info:

A short description of the bug
Steps to reproduce
What happens
What should happen instead
Any additional info such as code that demonstrates the problem, workarounds, etc.

If you have set up a web page that contains details about this bug I'll just post a description and a link to your page. Otherwise I'll put the text here and credit you with finding the bug.