ASP.NET Error when binding a GridView to a List of Objects?

Question

Error Message:

The data source for GridView with id 'FormProprietari' did not have any properties or attributes from which to generate columns. Ensure that your data source has content.

I have a ASP.NEt application in which I try to bind a GridView to a List<T> objects which from what I can tell on the net it should be possible.

This is my GridView:

<asp:GridView ID="FormProprietari" runat="server">
        <Columns>
            <asp:TemplateField >
                 <ItemTemplate> 
                    <%#((Lab_TAP_web.Proprietar)Container.DataItem).NumeProprietar%> 
                 </ItemTemplate>
            </asp:TemplateField>

            <asp:TemplateField >
                 <ItemTemplate> 
                    <%#((Lab_TAP_web.Proprietar)Container.DataItem).PrenumeProprietar%> 
                 </ItemTemplate>
            </asp:TemplateField>

            <asp:TemplateField >
                 <ItemTemplate> 
                    <%#((Lab_TAP_web.Proprietar)Container.DataItem).ProprietarID%> 
                 </ItemTemplate>
            </asp:TemplateField>
        </Columns>

    </asp:GridView>

And this is the function in which I add a new object of the Proprietar class I defined to the database then rebind the gridview to show it, I should mention that intially the database is empty and so is the gridview i,e it doesn't show up.

protected void Button2_Click(object sender, EventArgs e)
        {
            var Nume = TBNumeProprietar.Text;
            var Prenume = TBPreNumeProprietar.Text;

            MyCars db = DBSilo.db;

            Proprietar newOwner = new Proprietar();
            newOwner.NumeProprietar = Nume;
            newOwner.PrenumeProprietar = Prenume;
            newOwner.ProprietarID = (db.Proprietari.Count() + 1);
            //newOwner.ProprietarID = 1;



            db.Proprietari.InsertOnSubmit(newOwner);
            db.SubmitChanges();

            try
            {
                FormProprietari.DataSource = db.Proprietari.ToList();
            }
            catch (Exception)
            {

                throw;
            }
            FormProprietari.DataBind();           
        }

The problem being that I checked the List<Proprietar> which is the data source with breakpoints and the list always contains a Proprietar object.

Does anyone have a idea what I did wrong?

if you try Reponse.Write(db.Proprietari.Count().ToString()) does it give you a 1? — Marcianin
– Marcianin, Commented May 10, 2013 at 18:13
Yes it returns a 1, which is corect as there should be only 1 row. — George Bora
– George Bora, Commented May 10, 2013 at 18:40
You want to develop step-by-step. 1) Insert test records to database, and see those records display in GridView. 2) Then develop insert/update/delete. — Win
– Win, Commented May 10, 2013 at 23:19
@Win I'm sorry I'm not getting you, I've inserted test records in the db they exist I'm sure of it, what I'm trying to do is get them to show up which causes the error I posted, I don't need anything more from the gridview but to see the rows I inserted. — George Bora
– George Bora, Commented May 11, 2013 at 12:56
Please make sure you have getter and setter for each property of Proprietar class. If still not working, create a collection like this (without database) and debug/test GridView - stackoverflow.com/a/16407618/296861 — Win
– Win, Commented May 11, 2013 at 18:35

Win · Accepted Answer · 2013-05-12 02:47:43Z

1

Moved from comment to Answer.

Please make sure you have getter and setter for each property of Proprietar class like this -

public class Proprietar
{
    public string NumeProprietar { get; set; }
    public string PrenumeProprietar { get; set; }
    public int ProprietarID { get; set; }
}

answered May 12, 2013 at 2:47

Win

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