Let say that we have an object
class Entity
{
public string ID {get; set;}
public string Name {get; set;}
}
I want to bind properties to two textboxes on a page something like this:
<asp:FormView ID="FormView" runat="server">
<ItemTemplate>
<asp:textbox ID="TextId" Text='<%# Bind("ID") %>'/>
<asp:textbox ID="TextId" Text='<%# Bind("Name") %>'/>
</ItemTemplate>
</asp:FormView>
and then write this in code behind
public EntityObject
{
get { return ViewState["Entity"] as Entity; }
set { ViewState["Entity"] = value; }
}
protected override void OnInit(EventArgs e)
{
if (EntityObject== null)
EntityObject= new EntityObject();
FormView.DataSource = new[] { EntityObject };
FormView.DataBind();
base.OnInit(e);
}
And when I enter values in textboxes I expect EntityObject to have these values in properties when page reloads after PostBack, but properties are always null.
Sadly to say that, but ASP.NET does not support two-way binding to .net objects... instead you can use something like "manual binding" on every post back (here AddIncomeSources is RepeaterControl)
public List<Income> AdditionalIncomeList
{
get { return ViewState["AdditionalIncome"] as List<Income>; }
set { ViewState["AdditionalIncome"] = value; }
}
foreach (RepeaterItem item in AddIncomeSources.Items)
{
var amount = (TextBox)item.Controls.Cast<Control>().First(c => c.ID == "Amount");
var document = (DropDownList)item.Controls.Cast<Control>().First(c => c.ID == "Document");
AdditionalIncomeList[item.ItemIndex].Amount = amount.Text.ToDouble();
AdditionalIncomeList[item.ItemIndex].IncomeDocument = document.SelectedValue;
}
AddIncomeSources.DataSource = AdditionalIncomeList;
AddIncomeSources.DataBind();