>>>Hi,
>>>
>>>I have a datagrid defined like this:
>>>
>>>

                        <DataGrid AutoGenerateColumns="False" Grid.Row="4" Grid.Column="1" 
>>>                                  Height="Auto" 
>>>                                  HorizontalAlignment="Stretch" 
>>>                                  Margin="0" 
>>>                                  Name="grdCashReceipts" 
>>>                                  VerticalAlignment="Stretch" 
>>>                                  Width="Auto" 
>>>                                  IsSynchronizedWithCurrentItem="True" 
>>>                                  ItemsSource="{Binding Mode=default}" 
>>>                                  SelectionMode="Single" 
>>>                                  GridLinesVisibility="None" 
>>>                                  HeadersVisibility="Column" 
>>>                                  Grid.ColumnSpan="2" 
>>>                                  CellEditEnding="grdCashReceipts_CellEditEnding" 
>>>                                  CanUserAddRows="False" 
>>>                                  CanUserDeleteRows="False" 
>>>                                  SelectionUnit="Cell" 
>>>                                  Grid.RowSpan="2" 
>>>                                  AlternatingRowBackground="LightGray">
>>>                            <DataGrid.Resources>
>>>                                <Style x:Key="AlignRight" TargetType="DataGridCell">
>>>                                    <Setter Property="HorizontalAlignment" Value="Right" />
>>>                                </Style>
>>>                                <Style x:Key="AlignRightHeader" TargetType="DataGridColumnHeader">
>>>                                    <Setter Property="HorizontalAlignment" Value="Right" />
>>>                                </Style>
>>>                            </DataGrid.Resources>
>>>                            <DataGrid.Columns>
>>>                                <DataGridTextColumn Header="Invoice #"
>>>                                                    Width="*" 
>>>                                                    Binding="{Binding crt_invfk, Converter={StaticResource Inv_PkToNumberConverter}}"                                                     
>>>                                                    x:Name="txtInv_Number" IsReadOnly="False"/>
>>>
>>>                                <DataGridTextColumn Header="Invoice Date" 
>>>                                                    Width="*" 
>>>                                                    Binding="{Binding crt_invfk, Converter={StaticResource Inv_PkToInvoicePropertyConverter}, 
>>>                                                              ConverterParameter='inv_date', Mode=OneWay, StringFormat=d}"
>>>                                                    IsReadOnly="True"/>
>>>                                
>>>                                <DataGridTextColumn Header="Amount" 
>>>                                                    Width="*" 
>>>                                                    Binding="{Binding crt_Amount, Mode=default}"
>>>                                                    CellStyle="{StaticResource AlignRight}"
>>>                                                    HeaderStyle="{StaticResource AlignRightHeader}"/>
>>>                                
>>>                            </DataGrid.Columns>
>>>                        </DataGrid>

>>>
>>>In the following method, I need to determine if I am editing the Invoice # column or txtInv_Number textbox:
>>>
>>>

private void grdCashReceipts_CellEditEnding(object sender, DataGridCellEditEndingEventArgs e)

>>>
>>>How can I do that check?
>>
>>Haven't checked but doesn't e.Column give you that ?
>
>e.Column.Header gives me "Invoice #", but if I then change the # to "Number" because that's what the client wants then my code breaks. I can't see anything in there that gives me "txtInv_Number"

Don't know if you can get that. Bit ugly but could you depend on the binding? :

DataGridBoundColumn b = e.Column as DataGridBoundColumn;
            var v = b.Binding as System.Windows.Data.Binding;
            if (v.Path.Path == "crt_invfk")
            {
               //This is the column
            }