How to migrate from Newtonsoft.Json to System.Text.Json 

.NET Conf: Focus on Blazor is a free, one-day livestream event that features speakers from the community and .NET product teams that are working on building web apps with C# and Blazor. You don't need to use JavaScript anymore with Blazor technology! Blazor lets you build interactive web UIs using C# instead of JavaScript. 

.NET Core

• January 2020 Updates – 2.1.15, 3.0.2, and 3.1.1

• .NET Core 3.1.1 and .NET Core SDK 3.1.101( Release Notes | Download )

• .NET Core 3.0.2 and .NET Core SDK 3.0.102 ( Release Notes | Download )

• .NET Core 2.1.15 and .NET Core SDK 2.1.803 ( Release Notes | Download )

So Many Ways to Learn .NET in 2020 

• تغییر عرض عکس
  
• تغییر ارتفاع عکس
• تغییر فرمت عکس
• png
• jpg
• jpeg
  
• چرخش اتوماتیک
• تغییر کیفیت عکس (0-100)
• کش در مموری
• بعد از تغییر عرض و ارتفاع با هم انتخاب مود مورد نظر
• pad
  
• max 
• crop 
• stretch 

.NET Core 2.2 will reach End of Life on December 23, 2019 

The people from InfoQ released a free (mini)book about .NET Core. In this book, five authors talk about the current state of .NET Core 3.0 from multiple perspectives. Each author brings their experience and ideas on how different .NET Core 3.0 features are relevant to the .NET ecosystem, both present and future. 

Memory management and garbage collection (GC) in ASP.NET Core