Lines of a textbox

[lothos12345]

Is there away to limit the number of lines in a textbox using visual basic.net? Is so how?

[DiverDan]

Yeap. You can control the length and number of lines of text entered into a textbox through it's KeyPress sub. Here's a sample of and address textbox that limits the lines to 3 using an array & the split method to break apart the entered returns. I also measured the string to include text wrapping in the 3 line limit for the last line.

 

   Private Sub txtAddress_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtAddress.KeyPress

       If AscW(e.KeyChar) = 8 Then 'backspace
           e.Handled = False
           Exit Sub
       End If

       If txtAddress.Text.IndexOf(System.Environment.NewLine) > 0 Then
           Dim address() As String = Split(txtAddress.Text, System.Environment.NewLine)

           If address.GetUpperBound(0) > 1 Then
               If address.GetUpperBound(0) >= 2 _
               And AscW(e.KeyChar) = 13 Then 'enter key
                   e.Handled = True
               Else
                   Dim g As Graphics = Me.CreateGraphics
                   If g.MeasureString(address(2), txtAddress.Font).Width >= txtAddress.Width Then
                       e.Handled = True
                   Else : e.Handled = False
                   End If
                   g.Dispose()
               End If
           End If
       End If
   End Sub

[lothos12345]

Thank You

 

Thank you for your help it worked.