System.Windows.Forms.HexBox.KeyInterpreter.BeginMouseSelection C# (CSharp) Method

            void BeginMouseSelection(object sender, MouseEventArgs e)
            {
                _mouseDown = true;

                if(!_shiftDown)
                {
                    _bpiStart = new BytePositionInfo(_hexBox._bytePos, _hexBox._byteCharacterPos);
                    _hexBox.ReleaseSelection();
                }
                else
                {
                    UpdateMouseSelection(this, e);
                }
            }