[RESOLVED] (Question) Write in a specific line of a Textbox control

[Yuekio]

Suppose that i want to add new lines to a text inside a textbox control
Like this

TextBox2.Lines(13) = "111" & vbNewLine & "222"

So line 13 change to "111"
and create a new line (14) with this text "222"
so the previous line 14 now become line 15.

Can someone tell me which properties or function can I use to do this?

[jmcilhinney]

You use the Lines property, but you don't do it like that. Lines is not "live". You have to get an array from the Lines property, modify it and then assign it back. In this case, because you want to add a new line, I'd suggest using a List(Of String) in between too:

Dim arr = TextBox2.Lines
Dim lst As New List(Of String)(arr)

lst(13) = "111"
lst.Insert(14, "222")

arr = lst.ToArray()
TextBox2.Lines = arr

That can be condensed, of course:

Dim lst As New List(Of String)(TextBox2.Lines)

lst(13) = "111"
lst.Insert(14, "222")

TextBox2.Lines = lst.ToArray()

[jmcilhinney]

By the way, to be clear, both arrays and collections are zero-based, so the element or item at index 13 is actually the 14th element or item in the list.

[Yuekio]

You use the Lines property, but you don't do it like that. Lines is not "live". You have to get an array from the Lines property, modify it and then assign it back. In this case, because you want to add a new line, I'd suggest using a List(Of String) in between too:

Dim arr = TextBox2.Lines
Dim lst As New List(Of String)(arr)

lst(13) = "111"
lst.Insert(14, "222")

arr = lst.ToArray()
TextBox2.Lines = arr

That can be condensed, of course:

Dim lst As New List(Of String)(TextBox2.Lines)

lst(13) = "111"
lst.Insert(14, "222")

TextBox2.Lines = lst.ToArray()

Thanks you, It helped me a lot. Sorry for my bad english and my silly posts.