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I want to add a "Select One" option to a drop down list bound to a List<T>.
Once I query for the List<T>, how do I add my initial Item, not part of the data source, as the FIRST element in that List<T> ? I have:
// populate ti from data List<MyTypeItem> ti = MyTypeItem.GetTypeItems(); //create initial entry MyTypeItem initialItem = new MyTypeItem(); initialItem.TypeItem = "Select One"; initialItem.TypeItemID = 0; ti.Add(initialItem) <!-- want this at the TOP! // then DropDownList1.DataSource = ti; 
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You insert elements (objects) into a Java List using its add() method. Here is an example of adding elements to a Java List using the add() method: List<String> listA = new ArrayList<>(); listA. add("element 1"); listA.
The Insert method of List<T> class inserts an object at a given position. The first parameter of the method is the 0th based index in the List. <T>. The InsertRange() method can insert a collection at the given position.
Essentially, you're setting a Tag's name to the first value in tagList and adding it to the collection, then you're changing that same Tag's name to the second value in tagList and adding it again to the collection. Your collection of Tags contains several references to the same Tag object!
Use the Insert method:
ti.Insert(0, initialItem); Update: a better idea, set the "AppendDataBoundItems" property to true, then declare the "Choose item" declaratively. The databinding operation will add to the statically declared item.
<asp:DropDownList ID="ddl" runat="server" AppendDataBoundItems="true"> <asp:ListItem Value="0" Text="Please choose..."></asp:ListItem> </asp:DropDownList> http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.listcontrol.appenddatabounditems.aspx
-Oisin
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