Adding a field in productVariant table

Hi ,

I want to add a string size field in product variant table , Just wanted to know which models controllers i have to modify to achieve that.

https://www.nopcommerce.com/boards/t/11315/how-to-extending-nopcommerce-v20.aspx

I did follow the instructions on the manual but still having problems with , below is the things which i did :

Added the field in the database in product table and did some amendments in source file in the following files:
Nop.Data.Catalog.ProductMap.cs
Nop.Core.Catalog.Product.cs
Nop.Admin.Catalog.ProductModel.cs
Nop.Admin.ProductController.cs
MappingExtensions.cs
_CreateorUpdate.cshtml
dbo.ProductLoadAllPages in Stored Procedures
And Views in the Nop.Web

The backhand is adding the the value to the shortDescription field, instead of new field "Size" added to the database i added in the product table but its not showing in the front end , i have no idea why it is behaving like this.

I am using nopCommerce 2.2

Sorted out its all working fine now , thnx