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    copied!<p>Do you bind to an indexer?. can you show us how your DataList Property looks like?</p> <p>i did the same a while ago with an indexed property.</p> <pre><code> public SomeObjectWithIndexer DataList {get; set;} public class SomeObjectWithIndexer { public string this { get { ... } set { ... }//&lt;-- you need this one for TwoWay } } </code></pre> <p>EDIT: the reason that you cant edit your Property, is that you try to edit a "double field". one workaround would be to wrap your double into a class with INotifyPropertyChanged.</p> <pre><code>public class DataListItem { public double MyValue { get; set;}//with OnPropertyChanged() and stuff } </code></pre> <p>then you can use a</p> <pre><code>ObservableCollection&lt;DataListItem&gt; </code></pre> <p>and you can edit your value. the question wether the index are always the same stay still around :)</p> <pre><code>Binding binding = new Binding(string.Format("DataList[{0}].MyValue", n++)); </code></pre> <p>EDIT2: working example: just to show twoway is working</p> <pre><code>public class DataItem { public string Name { get; set; } public ObservableCollection&lt;DataListItem&gt; DataList { get; set; } public DataItem() { this.DataList = new ObservableCollection&lt;DataListItem&gt;(); } } </code></pre> <p>Wrapper for double:</p> <pre><code>public class DataListItem { private double myValue; public double MyValue { get { return myValue; } set { myValue = value; }//&lt;-- set breakpoint here to see that edit is working } } </code></pre> <p>usercontrol with a datagrid</p> <pre><code>&lt;UserControl x:Class="WpfStackoverflow.IndexCollectionDataGrid" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="300"&gt; &lt;DataGrid ItemsSource="{Binding MyList}" AutoGenerateColumns="False"&gt; &lt;DataGrid.Columns&gt; &lt;DataGridTextColumn Header="Name" Binding="{Binding Path=Name}" /&gt; &lt;DataGridTextColumn Header="Index1" Binding="{Binding Path=DataList[0].MyValue, Mode=TwoWay}" /&gt; &lt;DataGridTextColumn Header="Index2" Binding="{Binding Path=DataList[1].MyValue, Mode=TwoWay}" /&gt; &lt;/DataGrid.Columns&gt; &lt;/DataGrid&gt; &lt;/UserControl&gt; </code></pre> <p>.cs</p> <pre><code>public partial class IndexCollectionDataGrid : UserControl { public IndexCollectionDataGrid() { InitializeComponent(); this.MyList = new ObservableCollection&lt;DataItem&gt;(); var m1 = new DataItem() {Name = "test1"}; m1.DataList.Add(new DataListItem() { MyValue = 10 }); m1.DataList.Add(new DataListItem() { MyValue = 20 }); var m2 = new DataItem() { Name = "test2" }; m2.DataList.Add(new DataListItem() { MyValue = 100 }); m2.DataList.Add(new DataListItem() { MyValue = 200 }); this.MyList.Add(m1); this.MyList.Add(m2); this.DataContext = this; } public ObservableCollection&lt;DataItem&gt; MyList { get; set; } } </code></pre> <p>i hope you get in the right direction with this example. </p>
 

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