Write text on specific line in a textbox

[2005 user]

Thanks for the reply,

I get this error:

System.IndexOutOfRangeException was unhandled
Message="Index was outside the bounds of the array."

The textbox where I am trying to write text to is empty.

Dim lines As String() = TextBox1.Lines
 
lines(0) = "test"
 
TextBox1.Lines = lines