Hi Maria,
By comparing the values in the SubItems collection of the TreeNodeAdv and the search string, we can find the tree node having the search value in a particular column.
I have attached a sample that illustrates the same. Please have a look at it and let me know if this helps you.
http://websamples.syncfusion.com/samples/Tools.Windows/F62015/Main.htmBest regards,
Golda