The namespace name Infrastructure does not exist in a namespace system.data.entity

The namespace name Infrastructure does not exist in a     namespace system.data.entity

When you create Web Application with Entity Framework ,you may be get the following error as  shown in figure

  above  all errors have come ,because of missing one reference ,
                                            that is  EntityFramework.SqlServerCompact
 so...just add it to your solution.  

install EntityFramework.SqlServerCompact...

that's over you got rid of all references error............