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Validation not working

Posted By:      Posted Date: September 01, 2010    Points: 0   Category :ASP.Net
We are using devexpress controls, I don't know if this is a problem on devexpress controls or a problem in my project, but the validation is not working.   My metada class is like this,  but when I click on new row and not typing anything, its allowing me to save the data and not showing me the errors.  The grid and details grid are not even taking the UI Hint    public class EmpresaMetadata    {       [DataTypeAttribute(DataType.Custom)]       [UIHint("Id de la empresa")]       public object idEmpresa { get; set; }         [DataTypeAttribute(DataType.Text)]       [UIHint("Código")]       [Required(ErrorMessage="El campo código es requerido")]       [StringLength(20, ErrorMessage="El campo codigo es de maximo 20 caracteres")]       public object codigo { get; set; }         [DataTypeAttribute(DataType.Text)]       [UIHint("Razon Social&q

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