How to validate FormView data when using EnableModelValidation?

Question

I'm trying to use FormView and want to validate some data in the server side. I'm trying to use the property EnableModelValidation but MSDN is very incomplete for this.

I saw an aproach (but about Dynamic Data instead of just ObjectDataSource) where you throw a ValidationException and it will handle if you have a ValidationSummary. Unfortunately it crashes with the yellow error page instead of showing the summary.

Following is my class:

namespace FormViewTest
{
    [DataObject]
    public class Person
    {
        private int age;

        [DataObjectField(false)]
        public int Age
        {
            get { return age; }
            set
            {
                if (value < 0)
                {
                    throw new ValidationException("Invalid age");
                }
                age = value;
            }
        }

        public void Insert(Person p)
        { }

        public Person Get()
        {
            return new Person();
        }
    }
}

and the aspx:

<asp:FormView runat="server"
    DataSourceID="ObjectDataSource1"
    DefaultMode="Insert"
    EnableModelValidation="true">
    <InsertItemTemplate>
        Age:
        <asp:TextBox ID="AgeTextBox" runat="server"
            Text='<%# Bind("Age") %>' />
        <br />
        <asp:LinkButton ID="InsertButton" runat="server"
            CommandName="Insert"
            Text="Insert" />
    </InsertItemTemplate>
</asp:FormView>

<asp:ObjectDataSource ID="ObjectDataSource1" runat="server"
    DataObjectTypeName="FormViewTest.Person"
    InsertMethod="Insert" SelectMethod="Get"
    TypeName="FormViewTest.Person"></asp:ObjectDataSource>

<asp:ValidationSummary ID="ValidationSummary1" runat="server" />

I've tried to add other control as said in the article I mention but it did nothing:

<asp:DynamicValidator ErrorMessage="Error" runat="server"
    ControlToValidate="ObjectDataSource1"  />

I hope someone can help me to use this EnableModelValidation since there is no official documentation I could find about it.

Answer 1

Enabling that property is not going to do anything unless you are using DynamicData version of FormView See this for a better explanation on using ASP.NET Dynamic Data Scaffolding along with some useful links