>>However, ViewBag.ClientId returns null and so immediately after I fire that form it comes up with the Client No aleady exists message.
>>
>>Do you see how can I solve this problem?
>>
>>Thanks in advance.
>
>Bit hard to see where Number / ClientId comes from.
>
>But if, for example, ClientId is a control on the form then you can use the 'AdditionalFields' property of the Remote attribute when validating the name. Something like:

[Remote("doesClientNameExist", "Account",AdditionalFields = "ClientId")]

and

   public JsonResult doesClientNameExist(string UserName, string ClientId)
>    {
>        //.......
>    }

then you'll have both properties available. Don't know if this is what you were looking for tho :-{
>
>Also, without looking more, I've no suggestions as to why the validation fires on keypress......

This is what I have right now

public class ClientViewModel
    {
        public Client Client { get; set; }

        [Required]
        [DisplayName("Client No")]
        [UIHint("Number")]
        [Column("client_no", TypeName = "smallint")]
        [Remote("doesClientNoExist", "Client", HttpMethod = "POST", ErrorMessage = "Client Number already exists. Please enter a different Client Number.")]
        public virtual Int16 Number 
        {
            get { return Client.Number; }

            set { Client.Number = value; }
        }

        [Required]
        [Column("client_name", TypeName = "varchar")]
        [DisplayName("Client Name")]
        [MaxLength(30, ErrorMessage = "Client Name should not be longer than 30 characters")]
        [MinLength(3, ErrorMessage = "Client Name is too short")]
        [Remote("doesClientNameExist", "Client", HttpMethod = "POST", ErrorMessage = "Client Name already exists. Please enter a different Client Name.")]
        public virtual string Name
        {
            get { return Client.Name; }

            set { Client.Name = value; }
        }

        public int id { get; set; }
    }
}

Can you clarify how should I change it?

Thanks a lot again.

For validaions problems I posted it here
http://forums.asp.net/p/1869270/5252771.aspx/1?p=True&t=634922954745355214

This post shows all my current code.