Reference the namespaces with a using directive like this:
using EntityDataSource = Microsoft.AspNet.EntityDataSource.EntityDataSource;
using EntityDataSourceSelectingEventArgs = Microsoft.AspNet.EntityDataSource.EntityDataSourceSelectingEventArgs;
using EntityDataSourceChangingEventArgs = Microsoft.AspNet.EntityDataSource.EntityDataSourceChangingEventArgs;
using EntityDataSourceChangedEventArgs = Microsoft.AspNet.EntityDataSource.EntityDataSourceChangedEventArgs;
using EntityDataSourceContextCreatingEventArgs = Microsoft.AspNet.EntityDataSource.EntityDataSourceContextCreatingEventArgs;