Using FindControl to find TextBox in HeaderTemplate of DataGrid in ASP.NET WebForms

https://stackoverflow.com/questions/615950/how-do-i-access-a-control-in-the-headertemplate-of-my-gridview

In the above link there is this example:

Which uses FindControl to find a TextBox found in the HeaderTemplate of a ASP.NET Web Forms GridView.


Notice how it uses HeaderRow like this:  GV1.HeaderRow

I'm working on an old legacy web app which uses the older ASP.NET Web Forms DataGrid

DataGrid does not have HeaderRow.


What's the equivalent to these 2 lines for a DataGrid ?

        GridView GV1 = (GridView)FindControl("Lab_1_GV1");
        TextBox TXB1 = (TextBox)GV1.HeaderRow.FindControl("Lab_1_TX2GV1");