![System.Data.SqlClient.SqlException: Login failed for user 'IIS APPPOOL\DefaultAppPool' in IIS7 - ASP.NET,C#.NET,VB.NET ,JQuery,JavaScript,Gridview System.Data.SqlClient.SqlException: Login failed for user 'IIS APPPOOL\DefaultAppPool' in IIS7 - ASP.NET,C#.NET,VB.NET ,JQuery,JavaScript,Gridview](https://4.bp.blogspot.com/-dEo_1omOZxI/TdaciIotWwI/AAAAAAAAAiY/VrElCA2EhHE/s1600/Applicationfool.png)
System.Data.SqlClient.SqlException: Login failed for user 'IIS APPPOOL\DefaultAppPool' in IIS7 - ASP.NET,C#.NET,VB.NET ,JQuery,JavaScript,Gridview
![System.PlatformNotSupportedException: 'System.Data.SqlClient is not supported on this platform.' · Issue #289 · dotnet/SqlClient · GitHub System.PlatformNotSupportedException: 'System.Data.SqlClient is not supported on this platform.' · Issue #289 · dotnet/SqlClient · GitHub](https://user-images.githubusercontent.com/57915340/69759528-5592ae00-1130-11ea-995c-85e52d50e933.png)
System.PlatformNotSupportedException: 'System.Data.SqlClient is not supported on this platform.' · Issue #289 · dotnet/SqlClient · GitHub
![c# - Asp.net mvc error System.Data.SqlClient.SqlException: 'Invalid object name 'AspNetUsers'.' - Stack Overflow c# - Asp.net mvc error System.Data.SqlClient.SqlException: 'Invalid object name 'AspNetUsers'.' - Stack Overflow](https://i.stack.imgur.com/QF7Lr.jpg)
c# - Asp.net mvc error System.Data.SqlClient.SqlException: 'Invalid object name 'AspNetUsers'.' - Stack Overflow
![NET Core 2.1 System.Data.SqlClient is not supported on this platform · Issue #28416 · dotnet/runtime · GitHub NET Core 2.1 System.Data.SqlClient is not supported on this platform · Issue #28416 · dotnet/runtime · GitHub](https://user-images.githubusercontent.com/42179710/51105008-0bd6f880-17e8-11e9-998b-89fcd696f542.png)
NET Core 2.1 System.Data.SqlClient is not supported on this platform · Issue #28416 · dotnet/runtime · GitHub
![c# - Microsoft.Data.SqlClient NuGet is needed in some projects but others you can do using Microsoft.Data.SqlClient without the NuGet - Stack Overflow c# - Microsoft.Data.SqlClient NuGet is needed in some projects but others you can do using Microsoft.Data.SqlClient without the NuGet - Stack Overflow](https://i.stack.imgur.com/mx2Af.png)