Create Object Of MetadataType

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.NET4

I Have Created a MetaDataType Class For validation

public class EmployeeMetaData
    {
       public  string _EmpId;
        [Required(ErrorMessage = "Enter EmployeeId.")]
        [StringLength(5, ErrorMessage = "EmpId Is Not More Then 5 Characters.")]
        public string EmpId
        {
            get
            {
                return _EmpId;
            }
            set
            {
                _EmpId = value;
            }
        }
    }

Now I Create New Class

[MetadataType(typeof(EmployeeMetaData))]
   public class Employee
   {
   }

Now I Want to Use This Employee Class in My aspx page.
I am using the code like

protected void Page_Load(object sender, EventArgs e)
        {
            try
            {
                Employee objEmployee = new Employee();
                Response.Write(<big>objEmployee.EmpId</big>);
            }
            catch (Exception ex)
            {
                Response.Write(ex.Message);
            }
        }

But it is generating an error while i access properties from Object objEmployee.
Please help me how to get it.