Binaryworld - The number of lines in a multiline TextBox control ... [ VB -> Forms & Controls ]

You can quickly determine how many lines of text are contained in a multiline TextBox control whose Scrollbars property is set to 3-Both - that is, when the TextBox behaves like a programmer's editor - by counting the number of CR-LF characters in the Text property. You can do that in just one line of code as follows:

Click here to copy the following block

' Text1 is a multiline TextBox control
lineCount = Len(Text1.Text) - Len(Replace(Text1.Text, vbCrLf, vbCr))

However, this approach fails when Scrollbars = 2-Vertical, that is when the TextBox behave like a word processor and wraps longer lines.
A better approach - that works with any type of multiline TextBox control - is to send it the EM_GETLINECOUNT message:

Click here to copy the following block

Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal _
hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, _
lParam As Any) As Long
Const EM_GETLINECOUNT = &HBA

lineCount = SendMessage(Text1.hWnd, EM_GETLINECOUNT, 0, ByVal 0&)