private string GetLocalVariableName(ulong instructionPointer, uint localIndex)
            {
                ClrMethod     method             = _context.Runtime.GetMethodByAddress(instructionPointer);
                ClrModule     module             = method.Type.Module;
                string        pdbLocation        = module.TryDownloadPdb(null);
                IntPtr        iunkMetadataImport = Marshal.GetIUnknownForObject(module.MetadataImport);
                ISymbolReader reader             = null;
                ISymbolMethod symMethod          = null;

                try
                {
                    using (var binder = new SymBinder())
                    {
                        reader = binder.GetReader(
                            iunkMetadataImport, module.FileName, Path.GetDirectoryName(pdbLocation));

                        symMethod = reader.GetMethod(new SymbolToken((int)method.MetadataToken));
                        return(GetLocalVariableName(symMethod.RootScope, localIndex));
                    }
                }
                catch (COMException comEx)
                {
                    // E_FAIL occasionally occurs in ISymbolReader.GetMethod. Nothing we can do about it.
                    if ((uint)comEx.HResult == 0x80004005)
                    {
                        return("");
                    }

                    // 0x806D0005 occurs when the PDB cannot be found or doesn't contain the necessary
                    // information to create a symbol reader. It's OK to ignore.
                    if ((uint)comEx.HResult == 0x806D0005)
                    {
                        return("");
                    }

                    throw;
                }
                finally
                {
                    // These interfaces aren't IDisposable, but the underlying objects are. And it is
                    // important to dispose of them properly, because if their finalizer runs on exit,
                    // it crashes with an access violation.
                    if (reader != null)
                    {
                        ((IDisposable)reader).Dispose();
                    }
                    if (symMethod != null)
                    {
                        ((IDisposable)symMethod).Dispose();
                    }

                    Marshal.Release(iunkMetadataImport);
                }
            }