How would I add a string to textbox without clearing its contents VB6

How would I go about adding a string to this textbox without wiping it of it's contents?

For counter = 1 To 5 Step 1
If lengthofdeck(counter) >= length_user Then
  txtresult.Text = nameofdeck(counter)
  MsgBox ("Value: " & length_user & nameofdeck(counter) & " meets or exceeds the size requirement given")
End If
Next counter