Related topics
Sign in with Microsoft
Sign in or create an account.
Select a different account.
You have multiple accounts
Choose the account you want to sign in with.

Release Date:

Microsoft .NET Framework 4.8

The August 30, 2019 update for Windows 10, version 1903 includes cumulative reliability improvements in .NET Framework 3.5 and 4.8. We recommend that you apply this update as part of your regular maintenance routines. Before you install this update, see the Prerequisites and Restart requirement sections.

Quality and reliability improvements


Addresses a crash that occurs after enumerating event logs.


  • Addresses a regression caused by the fix for the issue involving bindings with DataContext explicitly on the binding path.

  • Addresses a handle leak during creation of a Window in WPF applications that are manifested for Per Monitor DPI V2 Awareness. This leak may cause extranious GC.Collect calls that can affect performance in Window creation scenarios.

  • Addresses a crash caused by ArgumentNullException when loading a DataGrid containing a ComboBox while automation is active.  For example, when navigating Visual Studio to the Text Editor\C#\Code Style > Naming page in Tools > Options.

Windows Forms

  • Enables the ability to select ComboBox edit field text by using mouse down+move.

  • Addresses an issue involving interaction between WPF user control and hosting WinForms app when processing keyboard input.

  • Addresses an issue that affects  Narrator/NVDA announcing PropertyGrid ComboBox expanding and collapsing action.

  • Addresses an issue that affects rendering ellipses (...) button of PropertyGrid control in HC mode to draw button background and dots as contrasted.


Addresses System.Web.Caching initialization issue when using ASP.NET cache on computers without IIS.

1 Bass Class Library (BCL)

2 Windows Presentation Foundation (WPF)

How to obtain and install the update

Install this update

To download and install this update, go to Settings Update & Security Windows Update, and then select Check for updates.

This update will be downloaded and installed automatically from Windows Update.

To get the standalone package for this update, go to the Microsoft Update Catalog website.

File information

For a list of the files that are provided in this update, download the file information for cumulative update 4511555.


To apply this update, you must have .NET Framework 3.5 or 4.8 installed.

Restart requirement

You must restart the computer after you apply this update if any affected files are being used. We recommend that you exit all .NET Framework-based applications before you apply this update.

Update replacement information

This update replaces previously released update 4502584.

How to obtain help and support for this update

Need more help?

Want more options?

Explore subscription benefits, browse training courses, learn how to secure your device, and more.

Communities help you ask and answer questions, give feedback, and hear from experts with rich knowledge.

Was this information helpful?

What affected your experience?
By pressing submit, your feedback will be used to improve Microsoft products and services. Your IT admin will be able to collect this data. Privacy Statement.

Thank you for your feedback!