public sub ClearTextboxes(controls as ControlCollection)
for each ctrl as Control in controls
if TypeOf ctrl is Textbox Then
ctrl.Text = String.Empty
else if ctrl.HasControls
ClearTextboxes(ctrl.Controls)
end if
next
end sub
Then just call it from your code like this
....
ClearTextboxes(me.Controls)
This method uses recursion to make sure all textboxes are cleared even if they are inside a container control.