This book is a full transcript of Software Diagnostics Services training with 20 step-by-step exercises, notes, source code of specially created modeling applications and selected Q&A. The course covers 22 .NET memory dump analysis patterns plus additional 15 unmanaged patterns. Learn how to analyze .NET Core 5 and .NET Framework CLR 4 application and service crashes and freezes, navigate through memory dump space (managed and unmanaged code) and diagnose corruption, leaks, CPU spikes, blocked threads, deadlocks, wait chains, resource contention, and much more. The training consists of practical step-by-step exercises using Microsoft WinDbg debugger to diagnose patterns in 64-bit and 32-bit process memory dumps. The training uses a unique and innovative pattern-oriented analysis approach to speed up the learning curve. The fourth edition has 7 new .NET Core exercises added for the latest WinDbg version and Windows 10 and updated command highlighting for the existing 12 .NET Framework exercises from the previous edition. This edition also includes a possibility to use a Docker WinDbg image with required symbol files instead of a local Debugging Tools for Windows installation. Prerequisites: Basic .NET programming and debugging. Audience: Software technical support and escalation engineers, system administrators, DevOps, performance and reliability engineers, software developers, and quality assurance engineers.