Convert.ToInt64 (Byte) converts 8-bit unsigned integer to 64-bit signed integer.
Module Example
Public Sub Main()
Dim bytes() As Byte = { Byte.MinValue, 14, 122, Byte.MaxValue}
Dim result As Long
For Each byteValue As Byte In bytes
result = Convert.ToInt64(byteValue)
Console.WriteLine(result)
Next
End Sub
End Module