When clicking on datagrid row it throws me exception - WPF C#

Question

Whenever I try to double click my datagrid row to edit it, I throws me a few exceptions which doesn't say anything to me. Hovever if
I set the whole datagrid to IsReadOnly to true, I want have the problem, but I need the second and third columns editable.
XAML
<DataGrid x:Name="clientList" HorizontalAlignment="Left" Height="225" Margin="11,126,0,0" VerticalAlignment="Top" Width="349" IsSynchronizedWithCurrentItem="False" AutoGenerateColumns="False" HorizontalGridLinesBrush="#FFB9B9B9" VerticalGridLinesBrush="#FF8B8B8B" GridLinesVisibility="Horizontal" CellStyle="{StaticResource Body_Content_DataGrid_Centering}">
<DataGrid.Resources>
<LinearGradientBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" StartPoint="0,0" EndPoint="0,1" >
<GradientStop Color="#66240000" Offset="0"/>
<GradientStop Color="#CC240000" Offset="0.65"/>
</LinearGradientBrush>
</DataGrid.Resources>
<DataGrid.Columns>
<DataGridTextColumn Width="30" Header="Id" IsReadOnly="True" Binding="{Binding Id}"/>
<DataGridTextColumn Width="100" Header="Company" IsReadOnly="False" Binding="{Binding Company}"/>
<DataGridTextColumn Width="130" Header="Name, Surname" IsReadOnly="False" Binding="{Binding Name}"/>
<DataGridTemplateColumn Header="Actions" CellTemplate="{StaticResource myTemplate}"/>
</DataGrid.Columns>
</DataGrid>
C#
clientList.Items.Add(new DataClients { Id = 1, Company = "My Company", Name = "Jane Roe"});
Exceptions
Exception:Thrown: "'EditItem' is not allowed for this view."(System.InvalidOperationException)
Exception:Thrown: "The string was not recognized as a valid DateTime. There is an unknown word starting at index 0." (System.FormatException)

Answer 1

You need to set the ItemsSource property of the clientList DataGrid to a collection of DataClients objects that supports editing. HashSet<DataClients> does not for example but List<DataClients> and ObservableCollection<DataClients> does.
You could call the ToList() method on the collection that you set as the ItemsSource for the DataGrid to convert it to a List<DataClients>:
clientList.ItemsSource = yourCollection.ToList();
The "The string was not recognized as a valid DateTime" error message should be pretty self-explanatory. You are trying to convert a string which doesn't contain a valid date or time value to a DateTime value somewhere, perhaps in the 'myTemplate'.
There is nothing in the DataClients class that you have posted that will cause this exception to be thrown so it is impossible for anyone to tell.
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