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 'Categoryid' was not present in the results of a 'FromSql' operation

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

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

RESEARCH
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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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_context.SaveChanges is not working

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_context.SaveChanges is not working

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Error The instance of entity type ModalType cannot

.NET 7
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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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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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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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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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[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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InvalidOperation: The connection was not closed. T

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

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How to Solve XUnit Automated Testing Error: Castle

MVC
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How to Solve XUnit Automated Testing Error: Castle DynamicProxy InvalidProxyConstructorArgumentsException

MVC
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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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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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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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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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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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Cassandra Entity Framework Error "TypeLoadExceptio

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

QUESTIONS
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InvalidOperationException: The property 'EntityNam

QUESTIONS
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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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SQL Server Tips and Tricks

SQL
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SQL Server Tips and Tricks

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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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Microsoft.EntityFrameworkCore.Database.Transaction

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

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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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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 5 Development Notes (DotNet Core 3.1 Study

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

SOFTWARE DEVELOPMENT
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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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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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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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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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Asp.Net MVC Development Notes

.NET 7
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Asp.Net MVC Development Notes

.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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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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Performance Tuning in Entity Framework Core 5 and

.NET 7
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Performance Tuning in Entity Framework Core 5 and AspNet 5

.NET 7
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Return url is required

.NET 7
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Return url is required

.NET 7
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Invalid column name '*_ID'

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Invalid column name '*_ID'

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InvalidOperationException: An error was generated

.NET 7
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InvalidOperationException: An error was generated for warning 'Microsoft.EntityFrameworkCore.Query.InvalidIncludePathError': Unable to find navigation 'EntityName' specified in string based include path 'AnotherEntity Name'.

.NET 7
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Microsoft Data SqlClient SqlException (0x80131904)

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Microsoft Data SqlClient SqlException (0x80131904) New transaction is not allowed because there are other threads running in the session

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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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An error was generated for warning 'Microsoft.Enti

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An error was generated for warning 'Microsoft.EntityFrameworkCore.Query.InvalidIncludePathError': Unable to find navigation specified in string based include path

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An Exception was thrown while attempting to evalua

.NET 7
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An Exception was thrown while attempting to evaluate the LINQ query parameter expression

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

SQL
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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'.

SQL
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HTTP Error 502.5 - Process Failure: The current .N

NETWORK
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HTTP Error 502.5 - Process Failure: The current .Net SDK does not support targeting .NET Core 3.0. Either target .NET Core 2.2 or lower. Visual Studio 2019 unable to locate .Net Core SDK

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Upgrading to .Net Core 3.1 Error Visual Studio 201

.NET 7
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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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Software Best Practices Learned by Experience

SYSTEM DESIGN
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Software Best Practices Learned by Experience

SYSTEM DESIGN
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HTTP Error 500.19 Internal server error

SERVERS
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HTTP Error 500.19 Internal server error

SERVERS
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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"

DOCKER
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InvalidOperationException, A second operation star

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InvalidOperationException, A second operation started on this context before a previous operation completed.

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ef core

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

Entity Framework Core 6 and 7 Tips and Tricks

Entity Framework Core 6 and 7 Tips and Tricks

Performance Tuning for ASP.NET Web Applications

Performance Tuning for ASP.NET Web Applications

InvalidOperationException: The required column 'Ca

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

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)

How to get the last record of Entity Framework mod

How to get the last record of Entity Framework model data

_context.SaveChanges is not working

_context.SaveChanges is not working

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.

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

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

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

[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.

InvalidOperation: The connection was not closed. T

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

How to Solve XUnit Automated Testing Error: Castle

How to Solve XUnit Automated Testing Error: Castle DynamicProxy InvalidProxyConstructorArgumentsException

[EF Core] How to Enable Sensitive Data Logging and

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

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.

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

System.InvalidOperationException: The ConnectionSt

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

InvalidOperationException: An exception was thrown

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

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

SQL Server Tips and Tricks

SQL Server Tips and Tricks

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

Microsoft.EntityFrameworkCore.Database.Transaction

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

Entity framework "InvalidCastException: Unable to

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

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 5 Development Notes (DotNet Core 3.1 Study

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

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

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

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

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

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

Asp.Net MVC Development Notes

Asp.Net MVC Development Notes

SqlException: Cannot insert the value NULL into co

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

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)

Performance Tuning in Entity Framework Core 5 and

Performance Tuning in Entity Framework Core 5 and AspNet 5

Return url is required

Return url is required

Invalid column name '*_ID'

Invalid column name '*_ID'

InvalidOperationException: An error was generated

InvalidOperationException: An error was generated for warning 'Microsoft.EntityFrameworkCore.Query.InvalidIncludePathError': Unable to find navigation 'EntityName' specified in string based include path 'AnotherEntity Name'.

Microsoft Data SqlClient SqlException (0x80131904)

Microsoft Data SqlClient SqlException (0x80131904) New transaction is not allowed because there are other threads running in the session