Read unread text into the given buffer.
Public Function ReadText( _
ByVal buf As System.Text.StringBuilder _
) As Integer
public int ReadText(
System.Text.string Builder buf
buf Target buffer for any read text.
The number of characters read or -1 if there are no more characters to read.
Any additional unread text must be read by subsequent calls to this method. Text is read from the beginning of any unread text.