How to change the color of Phone app - phone dialor - change color of call

 >Go to settings

>Go to Sim cards

>Click on sim slot

>Change the color of sim slot

Difference Between Const, ReadOnly and Static ReadOnly in C#

 https://www.csharp.com/UploadFile/c210df/difference-between-const-readonly-and-static-readonly-in-C-Sharp/

Pivot function in SQL Server

 https://www.selectdistinct.co.uk/2023/05/22/pivot-function-in-sql/

Struct vs class

 https://www.geeksforgeeks.org/c-sharp-structures-set-1/

Types in C#

 https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/language-specification/types#81-general