## Multi-line ASP.Net TextBox spacing changed when using AntiXSSEncoder

### Scope
Minor

### Version Introduced
4.5

### Source Analyzer Status
Available

### Change Description
In .NET Framework 4.0, extra lines were inserted between lines of a multi-line text box on postback, if using the `AntiXSSEncoder`. In .NET Framework 4.5, those extra line breaks are not included, but only if the web app is targeting .NET 4.5

- [x] Quirked
- [ ] Build-time break

### Recommended Action
Be aware that 4.0 web apps retargeted to .NET 4.5 may have multi-line text boxes improved to no longer insert extra line breaks. If this is not desirable, the app can have the old behavior when running on .NET Framework 4.5 by targeting the .NET Framework 4.0.

### Affected APIs
* Not detectable via API analysis

### Category
ASP.NET

[More information](http://connect.microsoft.com/VisualStudio/feedback/details/748052/textbox-with-multiline-textmode-adds-additional-linebreak-to-the-output)

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