How to I Binding values from one column to another with using DataTemplate? In C#, not in XAML.

 Code:

private void GenerateDataTemplates(int ColumnNumber)
{
    var dt = new DataTemplate();

    var spOuterFactory = new FrameworkElementFactory(typeof(StackPanel));
    spOuterFactory.SetValue(StackPanel.OrientationProperty, Orientation.Horizontal);
    spOuterFactory.SetValue(MarginProperty, new Thickness(10));

    var textBlock1 = new FrameworkElementFactory(typeof(TextBlock));
    var binding1 = new Binding();
    binding1.RelativeSource = new RelativeSource(RelativeSourceMode.FindAncestor, typeof (Row), 1);
    binding1.Path = new PropertyPath(string.Format("Cells[\"{0}\"].Content", dgTemplate.Columns[ColumnNumber].FieldName));//, new object[] {});
    textBlock1.SetBinding(TextBlock.TextProperty, binding1);
   
    textBlock1.SetValue(TextBlock.ForegroundProperty, Brushes.Black);
    spOuterFactory.AppendChild(textBlock1);

    dt.VisualTree = spOuterFactory;

    dgTemplate.Columns[ColumnNumber].CellContentTemplate = dt;
}

I dont know about binding two columns but I wouldn't create DataTemplates in c# (its depreciated and a pain in the butt).

I found a faster easier more natural way.

Add a WPF XAML Resource Dictionary to your project  then in your c# set the column like so

var myResourceDictionary = new MyResourceDictionary();

 column.CellContentTemplate = myResourceDictionary["DataTemplateKey"];

The beauty is that the XAML ResourceDictionary has its own CodeBehind too. Very Reuseable. Very Dynamic.

I have 20 Cell DataTemplates and CellEditors  in my ResourceDictionary useable anywhere I need them.