changed .net framework version

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I currently develop a project in MVC .Net Framework 4.5 now I change my version to 4.0 & I got several errors plz help me to solve this

1.

VB

Error   3   The type or namespace name 'RAMS' could not be found (are you missing a using directive or an assembly reference?)  D:\Avanzar Solution\PROJECT\RAMSSYSTEM\Controllers\HomeController.cs    13  7   RAMSSYSTEM

2.

Error	4	The type name 'TableAttribute' could not be found. This type has been forwarded to assembly 'System.ComponentModel.DataAnnotations, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'. Consider adding a reference to that assembly.	D:\Avanzar Solution\PROJECT\RAMSSYSTEM\Models\AccountModels.cs	21	6	RAMSSYSTEM

3.

Error	4	The type name 'TableAttribute' could not be found. This type has been forwarded to assembly 'System.ComponentModel.DataAnnotations, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'. Consider adding a reference to that assembly.	D:\Avanzar Solution\PROJECT\RAMSSYSTEM\Models\AccountModels.cs	21	6	RAMSSYSTEM

THANKS IN ADVANCE.... :)

Posted 4-Feb-14 0:27am

Dhruvin Sukhadiya

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Pete O'Hanlon · Answer 1 · 2014-02-04T00:31:00

Solution 1

You need to add a reference to System.ComponentModel.DataAnnotation to your project. As for the other issue, if you have multiple projects making up your solution, you will have to convert them all from .NET 4.5 to .NET 4 to work together.

Posted 4-Feb-14 0:31am

Pete O'Hanlon

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Dhruvin Sukhadiya 4-Feb-14 6:39am

thnx sir but I have already added following references

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Data.Entity;
using System.Globalization;
using System.Web.Security;

Pete O'Hanlon 4-Feb-14 6:47am

Those aren't references. Right click on the project references in Solution Explorer and choose "Add reference..." from the context menu.

Ankur^\m/ · Answer 2 · 2014-02-04T00:31:00

Solution 2

You are referencing these assemblies somewhere. Remove the reference and it should be fine.

Edit:
Or the other way, as Pete suggested, is to add the required assembly if you are using related classes

Posted 4-Feb-14 0:31am

Ankur^\m/

Updated 4-Feb-14 0:35am

v2

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Dhruvin Sukhadiya 4-Feb-14 6:43am

oh thanks sir but when i adding it gives errors when i removing it also again errors :)

Ankur^\m/ 4-Feb-14 6:55am

Then you must be doing it in the wrong way. ;)
Follow was Pete has suggested you.