Check if the text value is Newline in textbox

Question

I have a textbox with multiline property. When verify the textbox, it will go through a function to check whether the value of each characters is in my allowed range. I have some value that have a newline such as below:

"Sorabee keeps your skin moisturizing last longer!

Description

Sorabee Skin Care series keep your skin moisture"

This is 3 sentences which has 3 newline. How to insert this newline in my checking as below:

Public Function AllowedChar(ByVal str As String) As Integer
    Dim cnt As Integer
    Dim allowChars As Char() = "1234567890QWERTYUIOPASDFGHJKLZXCVBNMqwertyuiopasdfghjklzxcvbnm!+=-/., ?".ToCharArray()
    Try
        cnt = 0
        For Each ch As Char In str ' to check whether special character exist in a string
            If Array.IndexOf(allowChars, ch) = -1 Then
                cnt = cnt + 1
            End If
        Next
        Return cnt
    Catch ex As Exception
        strErrMsg = "Oops! Something is wrong with verify special characters at AllowedChar"
        MessageBox.Show(strErrMsg & vbCrLf & "Err: " & ex.Message)
    End Try
End Function

I can put a space to be verify. But how to put a newline as allowChars?

Answer 1

For a newline in a windows console application in Visual Basic, try this:

Console.WriteLine("hello", vbLf)

The vbLf makes a so called "Newline".