Buffer. Get Size(Int32)
Returns the size in characters of the buffer.
public int GetSize (out int piLength);
[out] Pointer to the size of the buffer, which is not necessarily the same value as the size of the buffer's internally-allocated memory or the size of the file (if any) represented by the buffer.
HRESULT IVsTextBuffer::GetSize( [out] long *piLength );
This method might require considerable resources, depending upon the underlying implementation of the buffer. That is, it might be very difficult to calculate the size of the buffer if it is a virtual-line-oriented implementation as in Visual Basic.