Metadatatype attribute not working

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C#

MVC4

entity-framework

Hello,
i am working on an MVC application and have used EF. [Database first approach].
I created Scaffold Template from EF. I have 2 tables tblEmployee and tblDepartment. Changed their name in edmx designer to Employee and Department.

Now when i go to index view which shows me all the employees there are two columns with name "Name" , one for employee and one for department. So now i want to change the Column name "Name" for department to "Department Name".

As i am using DB first approach can't do the changes in DataModel.Designer.cs
SO i created a partial class Department [ name is same as in Designer.cs]
decorated it with MetaDataType attribute and passed a class with name property to the type parameter.

All good till now. But now when i run the project i don't see the changes in the Index view. don't know what to do now.I am New to MVC. any sort of help is much appriciated !!!

What I have tried:

This is the new partial class that i created

[MetadataType( typeof(DepartmentMetaData))]
    public partial class Department
    {
    }

    public class DepartmentMetaData
    {
        [Display(Name = "Department Name")]
        public string Name { get; set; }
    }

this is the property in DataModel.Designer.cs

[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=true)]
      [DataMemberAttribute()]
      public global::System.String Name
      {
          get
          {
              return _Name;
          }
          set
          {
              OnNameChanging(value);
              ReportPropertyChanging("Name");
              _Name = StructuralObject.SetValidValue(value, true);
              ReportPropertyChanged("Name");
              OnNameChanged();
          }
      }

so the name of the property matches and there is a partial class . It should now change the name while showing records but it isn't. Please tell me if i missed something.