MaxLength Attribute not generating client-side validation attributes

Question

I have a curious problem with ASP.NET MVC3 client-side validation. I have the following class:

public class Instrument : BaseObject
{
    public int Id { get         


        

Answer 1

StringLength works great, i used it this way:

[StringLength(25,MinimumLength=1,ErrorMessage="Sorry only 25 characters allowed for 
              ProductName")]
public string ProductName { get; set; }

or Just Use RegularExpression without StringLength:

[RegularExpression(@"^[a-zA-Z0-9'@&#.\s]{1,25}$", ErrorMessage = "Reg Says Sorry only 25 
                   characters allowed for ProductName")]    
public string ProductName { get; set; }

but for me above methods gave error in display view, cause i had already ProductName field in database which had more than 25 characters

so finally i came across this and this post and tried to validate without model like this:

 

 @Html.TextBoxFor(model => model.ProductName, new
 {
 @class = "form-control",
 data_val = "true",
 data_val_length = "Sorry only 25 characters allowed for ProductName",
 data_val_length_max = "25",
 data_val_length_min = "1"
 })
  @Html.ValidationMessageFor(model => model.ProductName)
 

this solved my issue, you can also do validation manually using jquery or using ModelState.AddModelError

hope helps someone.