ASP.NET - Common Gotchas [closed]

Answer 1

Making a repeater-like control, and not knowing about INamingContainer.

Answer 2

Don't edit your web.config with notepad if you have accented characters, it will replace it with one with the wrong encoding. It will look the same though. Just your application will not run.

Answer 3

(VB.NET) If you send an Object via a Property's Get accessor into a function with a ByRef keyword, it will actually attempt to update the object using the Set accessor for the Property.

Ex:

UpdateName(ByRef aName as String)

UpdateName(Employee.Name) will attempt to update the name by using the Set on the Name property of Employee.

Answer 4

Custom controls are only supported by the designer when building the control or when building the page that uses the control, but not both.

Answer 5

I just learned this today: the Bind() method, as used with GridViews and ListViews, doesn't exist. It's actually hiding some Reflector magic that turns it into an Eval() and some kind of variable assignment.

The upshot of this is that calls like:

<%# FormatNameHelper(Bind("Name")) %>

that look perfectly valid will fail. See this blog post for more details.

Answer 6

When using a gridview without a datasource control (i.e. binding a dataset straight to the control) you need to manually implement sorting and paging events as shown here:

http://ryanolshan.com/technology/gridview-without-datasourcecontrol-datasource/