How do I set maximuml length of property grid item

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       [StringLength(40)]
       [DisplayName(ITEMNAME)]
       [XmlAttribute]
       public override string Label
       {
           get
           {
               return base.Label;
           }
           set
           {

               value = value.TrimEnd();   ignorieren


               if (value.length > 40)
               {
                //here I want a user not to allow to write more than 40 char
                  when user write something in  Name feild max Length 40 i want a user to allow

               }


           }
       }

This is my code for Property grid view for ITEMNAME i want that value should not be longer han 40 , max value is 40 so what i want to do is that when user enter a value grater than 40 want to make property feild disabled so that user can#t enter more.
After researching i found a stringLength attribute(System.ComponentModel.DataAnnotations) but its seems to be not working anyone help me in this or thete is another way to solve This ???????????

Posted 5-Sep-14 2:58am

Member 11000455

Updated 5-Sep-14 4:01am

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nrgjack · Answer 1 · 2014-09-05T04:27:00

it's mvc or standard web forms ?

System.ComponentModel.DataAnnotations is used with MVC
ex :

C#

public class User
{
    [Required(ErrorMessage = "Name is required.")]
    [MaxLength(40, ErrorMessage = "Name cannot be longer than 40 characters.")]
    public string Name { get; set; }
}

with web forms you can use regex validator

XML

<asp:RegularExpressionValidator runat="server" ID="valInput"
    ControlToValidate="txtInput"
    ValidationExpression="^[\s\S]{0,40}$"
    ErrorMessage="Please enter a maximum of 40characters"
    Display="Dynamic">*</asp:RegularExpressionValidator>

if it is only the display that you need to truncate you can use css and ellipsis

CSS

.truncate {
  width: 250px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

Member 11000455 · Answer 2 · 2014-09-07T23:06:00

Solution 2

its for Windows Form Application i am working with .Net 3.5 but its not supporting MaxLength attribute i have added .dll and using System.ComponentModel.DataAnnotations

Posted 7-Sep-14 23:06pm