Hi Ozcan Oksuz,
It seems the two issues you are observing are caused by a common problem. Let me explain a bit. In order to work with database connections in Visual Studio, you need to install a .Net provider for the backend you are going to work with (like the .Net Connector
for MySql). Usually those providers come with some dialogs that helps you to configure the connection string and which we are invoking when the user clicks on the New Connection button of the Enable Project
or Add new item
It seems such provider is needed by the wizards but is somehow not available on the system. I would suggest you to close the active connections from the Server Explorer window and delete the connection strings (if any) from the App.config file of your project. Then try to run the wizards again.
It would be helpful if you can share with us which database backend you are trying to use. If the steps above do not help, you can also try upgrading to the latest internal build with version 2010.1.414, we have done some fixes in that area recently.
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