dotnet / dotnet/project-system
The result in Core is inconsistent with Framework when adding a space for Default namespace
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- C#
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Description
**Visual Studio Version**: Version 16.11.0 Preview 1.0 [31319.401.d16.11]
**Steps to Reproduce**:
1. Create a Winforms core application.
2. Right click project to open properties window.
3. Find Application page, change Default namespace from WinFormsApp5 to WinForms App5(there is a space), then press enter key.
**Expected Behavior**:
For Framework, an error dialog pops up.
**Actual Behavior**:
For Core, it can be changed successfully.
**More info**:
1. This issue can also repro in .NET Core WPF and console app.
2. This is not a regression issue, it can also repro on 16.7.0 Preview 2.0.
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