Version 4 (V4) of the Amazon SDK for .NET has been released\$1

For information about breaking changes and migrating your applications, see the [migration topic](https://docs.amazonaws.cn/sdk-for-net/v4/developer-guide/net-dg-v4.html).

 [https://docs.amazonaws.cn/sdk-for-net/v4/developer-guide/net-dg-v4.html](https://docs.amazonaws.cn/sdk-for-net/v4/developer-guide/net-dg-v4.html)

# Amazon SDKs and Tools Reference Guide
SDKs and Tools Reference

The [Amazon SDKs and Tools Reference Guide](https://docs.amazonaws.cn/sdkref/latest/guide/overview.html) contains information that's relevant and important for many of the Amazon SDKs and toolkits and the Amazon CLI. The following are some examples of the information that the reference contains:
+ Information about the [shared Amazon `config` and `credentials` files](https://docs.amazonaws.cn/sdkref/latest/guide/file-format.html) and their [location](https://docs.amazonaws.cn/sdkref/latest/guide/file-location.html).
+ [Setting up Amazon accounts, users, and roles](https://docs.amazonaws.cn/sdkref/latest/guide/access-users.html)
+ [Configuration and authentication settings reference](https://docs.amazonaws.cn/sdkref/latest/guide/settings-reference.html)
+ [Amazon Common Runtime (CRT) libraries](https://docs.amazonaws.cn/sdkref/latest/guide/common-runtime.html)
+ [Amazon SDKs and tools maintenance policy](https://docs.amazonaws.cn/sdkref/latest/guide/maint-policy.html)
+ [Amazon SDKs and tools version support matrix](https://docs.amazonaws.cn/sdkref/latest/guide/version-support-matrix.html)