I've ran into problem very similar to this. I have a .dbproj Visual Studio database project. It deploys just fine in SQL Server Express. Now I want to deploy it to SQL Azure - I change the connection parameters but deployment fails with the following text:
C:\Program Files\MSBuild\Microsoft\VisualStudio\v10.0\TeamData\Microsoft.Data.Schema.TSqlTasks.targets(120,5): Error Deploy01234: The target database schema provider could not be determined. Deployment cannot continue. Done executing task "SqlDeployTask" -- FAILED.
Is deploying .dbproj projects to SQL Azure supported? How do I make Visual Studio deploy the database into SQL Azure? What are other ways to achieve more or less the same results except recreating the database manually using Azure portal?