Tipo de dato

Integer : 2,147,483,647
Long : 9,223,372,036,854,775,807

fuente

reemplazar caracteres y espacios

Public Function reemplazar_str(ByVal str As String) As String()
        Return Regex.Replace(str, "\s+", "@").Split("@")
    End Function

buscar caracteres dentro de un string

If str.IndexOfAny("�³Ã".ToCharArray()) <> -1 Then
End If

fuente

crear código qr

descargar dll

convertir de array bytes a string

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        Dim ISO88591 As System.Text.Encoding = System.Text.Encoding.GetEncoding("ISO-8859-1")
        Dim str As String = "áéíóú@Æ cajón afecto"
        Dim isoBytes() As Byte = ISO88591.GetBytes(str)
        Dim x As String = ISO88591.GetString(isoBytes)
        Dim p As String = ""

       x = ISO88591.GetString(isoBytes, 0, isoBytes.Length)

    End Sub

fuente

descuento

(cantidad x precio) x (1-%descuento/100)

arraylist a txt

System.IO.File.WriteAllLines("archivo.txt", arrayList.Cast(Of String).ToArray)