.NET Framework July 2021 Cumulative Update Preview

Today, we are releasing the July 2021 Cumulative Update Preview for .NET Framework.

Security

The July Cumulative Update Preview does not contain any new security fixes. See February 2021 Security and Quality Rollup for the latest security updates.

Quality and Reliability

This release contains the following quality and reliability improvements.

CLR¹

In scenarios with both high numbers of assemblies and high numbers of GC heaps, Server GC can encounter serious lock contention during generation 2 GCs. A config switch has been introduced as a workaround. It can either be enabled from a .config file:
```
<configuration>
  <runtime>
    <GCStaticsNoLock enabled="true"/>
  </runtime>
</configuration>
```
Or by setting environment variable COMPLUS_GCStaticsNoLockto a non-zero value. If the config switch is not enabled then behavior is unchanged compared to previous versions.

Windows Forms

Addresses an issue where some Windows Forms applications that use ToolStrip controls with ToolStripControlHost, and run under UIA Accessibility Tools, could make Accessibility Tools unresponsive.
Addresses a regression in the ComboBox item accessible object where Accessibility Tools was not able to distinguish between identical items in the ComboBox and was becoming unresponsive.

¹ Common Language Runtime (CLR)

Getting the Update

The Cumulative Update Preview is available via Windows Update and Microsoft Update Catalog.

Microsoft Update Catalog

You can get the update via the Microsoft Update Catalog.

**Note**: Customers that rely on Windows Update will automatically receive the .NET Framework version-specific updates. Advanced system administrators can use of the below direct Microsoft Update Catalog download links to .NET Framework version specific updates. Carefully review the .NET Framework version applicability to ensure that you only install updates on systems where they apply before installing updates.

Product Version	Cumulative Update
Windows 10, version 21H1
.NET Framework 3.5, 4.8	Catalog	5004331
Windows 10, version 20H2 and Windows Server, version 20H2
.NET Framework 3.5, 4.8	Catalog	5004331
Windows 10 2004 and Windows Server, version 2004
.NET Framework 3.5, 4.8	Catalog	5004331
Windows 10 1909
.NET Framework 3.5, 4.8	Catalog	5004333
Windows 10 1809 (October 2018 Update) and Windows Server 2019		5004414
.NET Framework 3.5, 4.7.2	Catalog	5004335
.NET Framework 3.5, 4.8	Catalog	5004332

Previous Monthly Rollups

The last few updates are listed below for your convenience:

The post .NET Framework July 2021 Cumulative Update Preview appeared first on .NET Blog.

source https://devblogs.microsoft.com/dotnet/net-framework-july-2021-cumulative-update-preview/

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