Solved Solutions to computer programming Errors

Entity Framework Core Error: To change the IDENTIT

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Entity Framework Core Error: To change the IDENTITY property of a column, the column needs to be dropped and recreated

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InvalidOperationException: The required column 'Ca

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InvalidOperationException: The required column 'Categoryid' was not present in the results of a 'FromSql' operation

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InvalidOperation: The connection was not closed. The connections current state is connecting

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Error The instance of entity type ModalType cannot

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Error The instance of entity type ModalType cannot be tracked because another instance with the key value {id: 7656544} is already being tracked.

.NET 7
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[Solved] Entity Framework Core (EF 6) Error: Unabl

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[Solved] Entity Framework Core (EF 6) Error: Unable to track an entity of type 'YourModalName' because primary key property 'id' is null.

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[EF Core] How to Enable Sensitive Data Logging and

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[EF Core] How to Enable Sensitive Data Logging and Detailed Errors

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Entity Framework Core 6 and 7 Tips and Tricks

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Entity Framework Core 6 and 7 Tips and Tricks

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How to Solve XUnit Automated Testing Error: Castle

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How to Solve XUnit Automated Testing Error: Castle DynamicProxy InvalidProxyConstructorArgumentsException

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Performance Tuning for ASP.NET Web Applications

.NET 7
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Performance Tuning for ASP.NET Web Applications

.NET 7
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How to get the last record of Entity Framework mod

.NET 7
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How to get the last record of Entity Framework model data

.NET 7
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Asp.Net Core Error: InvalidOperationException: The

.NET 7
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Asp.Net Core Error: InvalidOperationException: The database generated a null value for non-nullable property 'PropertyName' of entity type 'EntityName'. Ensure value generation configuration in the database matches the configuration in the model

.NET 7
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The expression 'b.listOfFileRecords' is invalid in

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The expression 'b.listOfFileRecords' is invalid inside an 'Include' operation, since it does not represent a property access

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EF Core 6 Error: Error Number:262,State:1,Class:14

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EF Core 6 Error: Error Number:262,State:1,Class:14 CREATE TABLE permission denied in database

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Asp.Net Core EF Core Error: Cannot access a dispos

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Asp.Net Core EF Core Error: Cannot access a disposed object. A common cause of this error is disposing a context that was resolved from dependency injection and then later trying to use the same context instance elsewhere in your application. This may occur if you are calling Dispose() on the context, or wrapping the context in a using statement. If you are using dependency injection, you should let the dependency injection container take care of disposing context instances.

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Entity framework "InvalidCastException: Unable to

.NET 7
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Entity framework "InvalidCastException: Unable to cast object of type 'System.Int32' to type 'System.Decimal."

.NET 7
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Connection Timeout Expired. The timeout period el

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Connection Timeout Expired. The timeout period elapsed while attempting to consume the pre-login handshake acknowledgement. This could be because the pre-login handshake

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Microsoft.EntityFrameworkCore.Database.Transaction

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Microsoft.EntityFrameworkCore.Database.Transaction[20205] An error occurred using a transaction.

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How to Count the Number of records in the Database

.NET 7
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How to Count the Number of records in the Database Table using Asp.Net Core Entity Framework Core

.NET 7
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SQL Server Tips and Tricks

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SQL Server Tips and Tricks

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InvalidOperationException: An exception was thrown

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InvalidOperationException: An exception was thrown while attempting to evaluate the LINQ query parameter expression

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System.ObjectDisposedException: Cannot access a di

System.ObjectDisposedException: Cannot access a disposed context instance. A common cause of this error is disposing a context instance that was resolved from dependecy injection and then later trying to use the same context instance elsewhere in your application.

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System.InvalidOperationException: The ConnectionSt

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System.InvalidOperationException: The ConnectionString property has not been initialized [EF Core 7, Asp.Net 7]

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The configured execution strategy 'SlqServerRetryi

.NET 7
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The configured execution strategy 'SlqServerRetryingExecutionStrategy' does not support user-initiated transactions. Use the execution strategy returned by DbContext.Database.CreateExecutionStrategy()' to execute

.NET 7
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Sql Server Error, Entity Framework Core Error: An

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Sql Server Error, Entity Framework Core Error: An unhandled exception occurred while processing the request. SqlException: Invalid column name 'ColumnName'. Invalid column name 'AnotherColumnName'.

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Cassandra Entity Framework Error "TypeLoadExceptio

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Cassandra Entity Framework Error "TypeLoadException: Method 'GenerateScript' in type"

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InvalidOperationException: The property 'EntityNam

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InvalidOperationException: The property 'EntityName' has a temporary value while attempting to change the entity's state

QUESTIONS
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Asp.Net 5 Development Notes (DotNet Core 3.1 Study

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Asp.Net 5 Development Notes (DotNet Core 3.1 Study Notes)

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How to Select Top Distinct Values from a LINQ Grou

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How to Select Top Distinct Values from a LINQ Group by Results using Entity Framework Core

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How to Use DisplayFor to Display Text from EF Core

.NET 7
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How to Use DisplayFor to Display Text from EF Core Data Annotation in MVC and Components

.NET 7
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An Exception occurred in the database while saving

.NET 7
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An Exception occurred in the database while saving changes for context type 'ContextType' Microsoft.Data.SqlClient.SqlException (0x80131904)

.NET 7
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SqlException: A connection was successfully establ

.NET 7
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SqlException: A connection was successfully established with the server, but then an error occurred during the login process. (provider: SSL Provider, error: 0 - The certificate chain was issued by an authority that is not trusted.)

.NET 7
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Asp.Net MVC Development Notes

.NET 7
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Asp.Net MVC Development Notes

.NET 7
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What is New in Entity Framework 5 Shipped in Asp.N

.NET 7
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What is New in Entity Framework 5 Shipped in Asp.Net 5

.NET 7
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The instance of entity type 'IdentityUserLogin<str

.NET 7
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The instance of entity type 'IdentityUserLogin<string>' cannot be tracked because another instance with the same key value for {'LoginProvider', 'ProviderKey'} is already being tracked

.NET 7
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Asp.Net Core 3.1 Razor Error: CS1003: Syntax erro

.NET 7
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Asp.Net Core 3.1 Razor Error: CS1003: Syntax error, ',' expected

.NET 7
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Asp.Net Core 3.1 Razor View Error: CS1963: An expr

.NET 7
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Asp.Net Core 3.1 Razor View Error: CS1963: An expression tree may not contain a dynamic operation

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Docker on Raspberry Pi Error .Net Core 3.1 Error:

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Docker on Raspberry Pi Error .Net Core 3.1 Error: standard_init_linux.go:211: exec user process caused "exec format error"

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Solved: docker-compose build asp.net core 3.0 erro

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Solved: docker-compose build asp.net core 3.0 error rzc discover exited with code 150

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HTTP Error 500.19 Internal server error

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HTTP Error 500.19 Internal server error

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Asp.Net Core 3.1 MVC 5 Error ViewBag does not Exis

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Asp.Net Core 3.1 MVC 5 Error ViewBag does not Exist in the Current Context

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Upgrading to .Net Core 3.1 Error Visual Studio 201

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Upgrading to .Net Core 3.1 Error Visual Studio 2019: dotnet core 3.1 rzc generate exited with code 2147450730

.NET 7
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SqlException: Cannot insert the value NULL into co

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SqlException: Cannot insert the value NULL into column 'Id', table 'dbo.TableName'; column does not allow nulls. INSERT fails. The statement has been terminated

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Asp.Net Core GRPC Client Error: the type name "Gre

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Asp.Net Core GRPC Client Error: the type name "GreeterClient" does not exist in the type Greeter

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The framework 'Microsoft.AspNetCore.App' version'3

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The framework 'Microsoft.AspNetCore.App' version'3.1.0' was not found

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[HTTP Error 500.30]: Failed to load coreclr.Except

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[HTTP Error 500.30]: Failed to load coreclr.Exception message CLR worker thread exited prematurely

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SignalR Error in Dot Net Core 3.1 (.Net Core 3.1)

.NET 7
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SignalR Error in Dot Net Core 3.1 (.Net Core 3.1) : "Failed to invoke 'SendMessage' due to an error on the server".

.NET 7
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Could not copy the file to the destination file be

.NET 7
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Could not copy the file to the destination file because the destination is a folder instead of a file. To copy the source file into a folder, consider using the DestinationFolder parameter instead of DestinationFiles

.NET 7
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HTTP Dot Net Core 2.2 Error 500.30 - ANCM In-Proce

.NET 7
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HTTP Dot Net Core 2.2 Error 500.30 - ANCM In-Process Start Failure

.NET 7
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EF Core Error

Entity Framework Core Error: To change the IDENTIT

Entity Framework Core Error: To change the IDENTITY property of a column, the column needs to be dropped and recreated

InvalidOperationException: The required column 'Ca

InvalidOperationException: The required column 'Categoryid' was not present in the results of a 'FromSql' operation

_context.SaveChanges is not working

_context.SaveChanges is not working

What is New in Asp Net 7 and EF Core 7 (Best Featu

What is New in Asp Net 7 and EF Core 7 (Best Features)

InvalidOperation: The connection was not closed. T

InvalidOperation: The connection was not closed. The connections current state is connecting

Error The instance of entity type ModalType cannot

Error The instance of entity type ModalType cannot be tracked because another instance with the key value {id: 7656544} is already being tracked.

[Solved] Entity Framework Core (EF 6) Error: Unabl

[Solved] Entity Framework Core (EF 6) Error: Unable to track an entity of type 'YourModalName' because primary key property 'id' is null.

[EF Core] How to Enable Sensitive Data Logging and

[EF Core] How to Enable Sensitive Data Logging and Detailed Errors

Entity Framework Core 6 and 7 Tips and Tricks

Entity Framework Core 6 and 7 Tips and Tricks

How to Solve XUnit Automated Testing Error: Castle

How to Solve XUnit Automated Testing Error: Castle DynamicProxy InvalidProxyConstructorArgumentsException

Performance Tuning for ASP.NET Web Applications

Performance Tuning for ASP.NET Web Applications

How to get the last record of Entity Framework mod

How to get the last record of Entity Framework model data

Asp.Net Core Error: InvalidOperationException: The

Asp.Net Core Error: InvalidOperationException: The database generated a null value for non-nullable property 'PropertyName' of entity type 'EntityName'. Ensure value generation configuration in the database matches the configuration in the model

The expression 'b.listOfFileRecords' is invalid in

The expression 'b.listOfFileRecords' is invalid inside an 'Include' operation, since it does not represent a property access

EF Core 6 Error: Error Number:262,State:1,Class:14

EF Core 6 Error: Error Number:262,State:1,Class:14 CREATE TABLE permission denied in database

Asp.Net Core EF Core Error: Cannot access a dispos

Entity framework "InvalidCastException: Unable to

Entity framework "InvalidCastException: Unable to cast object of type 'System.Int32' to type 'System.Decimal."

Connection Timeout Expired. The timeout period el

Connection Timeout Expired. The timeout period elapsed while attempting to consume the pre-login handshake acknowledgement. This could be because the pre-login handshake

Microsoft.EntityFrameworkCore.Database.Transaction

Microsoft.EntityFrameworkCore.Database.Transaction[20205] An error occurred using a transaction.

How to Count the Number of records in the Database

How to Count the Number of records in the Database Table using Asp.Net Core Entity Framework Core

SQL Server Tips and Tricks

SQL Server Tips and Tricks

InvalidOperationException: An exception was thrown

InvalidOperationException: An exception was thrown while attempting to evaluate the LINQ query parameter expression

System.ObjectDisposedException: Cannot access a di

System.ObjectDisposedException: Cannot access a disposed context instance. A common cause of this error is disposing a context instance that was resolved from dependecy injection and then later trying to use the same context instance elsewhere in your application.

System.InvalidOperationException: The ConnectionSt

System.InvalidOperationException: The ConnectionString property has not been initialized [EF Core 7, Asp.Net 7]

The configured execution strategy 'SlqServerRetryi

The configured execution strategy 'SlqServerRetryingExecutionStrategy' does not support user-initiated transactions. Use the execution strategy returned by DbContext.Database.CreateExecutionStrategy()' to execute

Sql Server Error, Entity Framework Core Error: An

Sql Server Error, Entity Framework Core Error: An unhandled exception occurred while processing the request. SqlException: Invalid column name 'ColumnName'. Invalid column name 'AnotherColumnName'.

Cassandra Entity Framework Error "TypeLoadExceptio

Cassandra Entity Framework Error "TypeLoadException: Method 'GenerateScript' in type"

InvalidOperationException: The property 'EntityNam

InvalidOperationException: The property 'EntityName' has a temporary value while attempting to change the entity's state

Asp.Net 5 Development Notes (DotNet Core 3.1 Study

Asp.Net 5 Development Notes (DotNet Core 3.1 Study Notes)

How to Select Top Distinct Values from a LINQ Grou

How to Select Top Distinct Values from a LINQ Group by Results using Entity Framework Core

How to Use DisplayFor to Display Text from EF Core

How to Use DisplayFor to Display Text from EF Core Data Annotation in MVC and Components

An Exception occurred in the database while saving

An Exception occurred in the database while saving changes for context type 'ContextType' Microsoft.Data.SqlClient.SqlException (0x80131904)

SqlException: A connection was successfully establ

SqlException: A connection was successfully established with the server, but then an error occurred during the login process. (provider: SSL Provider, error: 0 - The certificate chain was issued by an authority that is not trusted.)

Asp.Net MVC Development Notes

Asp.Net MVC Development Notes

What is New in Entity Framework 5 Shipped in Asp.N

What is New in Entity Framework 5 Shipped in Asp.Net 5

The instance of entity type 'IdentityUserLogin<str

The instance of entity type 'IdentityUserLogin<string>' cannot be tracked because another instance with the same key value for {'LoginProvider', 'ProviderKey'} is already being tracked

Asp.Net Core 3.1 Razor Error: CS1003: Syntax erro

Asp.Net Core 3.1 Razor Error: CS1003: Syntax error, ',' expected

Asp.Net Core 3.1 Razor View Error: CS1963: An expr

Asp.Net Core 3.1 Razor View Error: CS1963: An expression tree may not contain a dynamic operation

Docker on Raspberry Pi Error .Net Core 3.1 Error:

Docker on Raspberry Pi Error .Net Core 3.1 Error: standard_init_linux.go:211: exec user process caused "exec format error"

Solved: docker-compose build asp.net core 3.0 erro

Solved: docker-compose build asp.net core 3.0 error rzc discover exited with code 150