Hide Column inside a WPF DataGrid

I assume that you are using automatic column population to populate your grid. If you want to hide a column, then you can't really do this - you need to explicitly set the column information manually. To do this, use something like this:

<dg:DataGrid x:Name="dgFollowUp" AutoGenerateColumns="False">
  <dg:DataGrid.Columns>
    <dg:DataGridTextColumn Binding="{Binding Column1}" Header="Column 1" />
    <dg:DataGridTextColumn Binding="{Binding Column2}" Header="Column 1" />
  </dg:DataGrid.Columns>
</dg:DataGrid AutoGenerateColumns="False">

Additionally, While
AutoGenerateColumns="True" you can handle the WPF datagrid event: DataGrid1_AutoGeneratingColumn(....)
you will find e.Column.Header, compare the columns which all you want to hide, then simply do as e.Column.Visibility = visibility.Hidden