Solved Solutions to computer programming Errors

[Solved] Asp.Net Core 3.1 config.GetSection return

.NET 7
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[Solved] Asp.Net Core 3.1 config.GetSection returns null. AppSettings.json null values.

.NET 7
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SqlNullValueException: Data is Null. This method o

ENTITY FRAMEWORK
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SqlNullValueException: Data is Null. This method or property cannot be called on Null values

ENTITY FRAMEWORK
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Cannot insert the value NULL into column 'Id', table 'TableName'; column does not allow nulls. INSERT fails

RESEARCH
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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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warning CS8632: The annotation for nullable refer

.NET 7
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warning CS8632: The annotation for nullable reference types should only be used in code within a '#nullable' annotations context.

.NET 7
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Redis Docker Container Error ArgumentException: No

DOCKER
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Redis Docker Container Error ArgumentException: No endpoints specified (Parameter 'configuration')

DOCKER
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SqlNullValueException: Data is Null. This method o

QUESTIONS
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SqlNullValueException: Data is Null. This method or property cannot be called on Null values

QUESTIONS
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What does COALESCE do in SQL

SQL
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What does COALESCE do in SQL

SQL
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Asp.Net Adding Object to Database Error: Collectio

.NET 7
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Asp.Net Adding Object to Database Error: Collection was modified; enumeration operation may not execute

.NET 7
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An unhandled exception occurred while processing t

.NET 7
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An unhandled exception occurred while processing the request: FormatException: The header contains invalid values at index 0

.NET 7
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An unhandled exception has occurred while executin

.NET 7
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An unhandled exception has occurred while executing the request. System.ArgumentNullException: Value cannot be null. (Parameter 'buffer')

.NET 7
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How to use one appsettings.json file across muilti

TECHNOLOGY
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How to use one appsettings.json file across muiltiple applications

TECHNOLOGY
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How to check if string is null before replacing ch

SQL
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How to check if string is null before replacing charecters in C-Sharp (C#)

SQL
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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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How to copy data from one table to a new table wit

RESEARCH
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How to copy data from one table to a new table with primary and foreign keys respected

RESEARCH
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Software Development Refactoring Wisdom I gained t

SOFTWARE DEVELOPMENT
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Software Development Refactoring Wisdom I gained through Reviewing My Own Code

SOFTWARE DEVELOPMENT
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[Entity Framework Core 5] An Unhandled Exception O

ENTITY FRAMEWORK
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[Entity Framework Core 5] An Unhandled Exception Occurred While Processing the Request

ENTITY FRAMEWORK
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Migrate Existing Asp.Net Web Site to .Net Core

.NET 7
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Migrate Existing Asp.Net Web Site to .Net Core

.NET 7
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Machine Learning Course Udamy Notes

MACHINE-LEARNING
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Machine Learning Course Udamy Notes

MACHINE-LEARNING
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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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Find Out Which Database Contain A Table

DATABASES
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Find Out Which Database Contain A Table

DATABASES
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NullReferenceException: Object reference not set t

TECHNOLOGY
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NullReferenceException: Object reference not set to an instance of an object

TECHNOLOGY
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System.IO.FileNotFoundException: Could not load fi

.NET 7
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System.IO.FileNotFoundException: Could not load file or assembly 'System.Runtime.CompilerServices.Unsafe, Version=6.0.0.0, Culture=neutral

.NET 7
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InvalidOperationException: There is no ViewData it

.NET 7
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InvalidOperationException: There is no ViewData item of type 'IEnumerable<SelectListItem>' that has the key 'Department'

.NET 7
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Drupal 8 Bootstrap 4 Not Loading CSS Files

BOOTSTRAP
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Drupal 8 Bootstrap 4 Not Loading CSS Files

BOOTSTRAP
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How to get localized string from ASP.NET Core Cont

.NET 7
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How to get localized string from ASP.NET Core Controller Work Around

.NET 7
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ArgumentException: Affinity key name set on the cl

SERVERS
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ArgumentException: Affinity key name set on the cluster 'allclusterprops' must not be null.

SERVERS
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SqlException: Cannot insert the value NULL into co

ENTITY FRAMEWORK
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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

ENTITY FRAMEWORK
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Linux service returns (code=exited, status=2)

LINUX
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Linux service returns (code=exited, status=2)

LINUX
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[Access,Excel Linked Table Problem] Solved!!

TECHNOLOGY
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[Access,Excel Linked Table Problem] Solved!!

TECHNOLOGY
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[AspNet 5 Entity Framework 6 Error] InvalidOperati

.NET 7
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[AspNet 5 Entity Framework 6 Error] InvalidOperationException: The property "ModelName.Id" has a temporary value while attempting to change the entity's state to "Modified". Either set a permanent value explicitly, or ensure that the database is configured to generate values for this property.

.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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RuntimeBinderException: 'System.Dynamic.DynamicObj

.NET 7
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RuntimeBinderException: 'System.Dynamic.DynamicObject'does not contain a definition for 'Modal'

.NET 7
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Asp.Net Core MVC Razor View Form not posting data

.NET 7
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Asp.Net Core MVC Razor View Form not posting data to the Server-Side

.NET 7
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OverflowException: Value was either too large or t

.NET 7
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OverflowException: Value was either too large or too small for an Int32

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

TECHNOLOGY
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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

TECHNOLOGY
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Cassandra Entity Framework Error "TypeLoadExceptio

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

QUESTIONS
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There is no remote user 'distributor_admin' mapped

SQL
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There is no remote user 'distributor_admin' mapped to local user '(null)' from the remote server 'repl_distributor'.

SQL
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Excel Programming

TECHNOLOGY
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Excel Programming

TECHNOLOGY
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Understanding Sequences in Transact-SQL (SQL Study

SQL
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Understanding Sequences in Transact-SQL (SQL Study Material)

SQL
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SQL Server Tips and Tricks

SQL
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SQL Server Tips and Tricks

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

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

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

ENTITY FRAMEWORK
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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.

ENTITY FRAMEWORK
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How to provide default values to an ASP.Net Core D

.NET 7
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How to provide default values to an ASP.Net Core DropDownList MVC

.NET 7
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Asp.Net Core EF Core Error: Cannot access a dispos

ENTITY FRAMEWORK
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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.

ENTITY FRAMEWORK
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How to get another User Claims or Add User to a Ro

.NET 7
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How to get another User Claims or Add User to a Role in Asp.Net Core Application

.NET 7
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How to send JSON data in HTTP Request Body to a do

DATABASES
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How to send JSON data in HTTP Request Body to a dot net core Web API using Postman

DATABASES
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SQL: How to Insert INTO values from another table

SQL
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SQL: How to Insert INTO values from another table into another table

SQL
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AppSettings.json has null values

[Solved] Asp.Net Core 3.1 config.GetSection return

[Solved] Asp.Net Core 3.1 config.GetSection returns null. AppSettings.json null values.

SqlNullValueException: Data is Null. This method o

SqlNullValueException: Data is Null. This method or property cannot be called on Null values

HTTP Error 500.30 - ASPNET CORE app failed to star

HTTP Error 500.30 - ASPNET CORE app failed to start

Cannot insert the value NULL into column 'Id', tab

Cannot insert the value NULL into column 'Id', table 'TableName'; column does not allow nulls. INSERT fails

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

warning CS8632: The annotation for nullable refer

warning CS8632: The annotation for nullable reference types should only be used in code within a '#nullable' annotations context.

Redis Docker Container Error ArgumentException: No

Redis Docker Container Error ArgumentException: No endpoints specified (Parameter 'configuration')

SqlNullValueException: Data is Null. This method o

SqlNullValueException: Data is Null. This method or property cannot be called on Null values

What does COALESCE do in SQL

What does COALESCE do in SQL

Asp.Net Adding Object to Database Error: Collectio

Asp.Net Adding Object to Database Error: Collection was modified; enumeration operation may not execute

An unhandled exception occurred while processing t

An unhandled exception occurred while processing the request: FormatException: The header contains invalid values at index 0

An unhandled exception has occurred while executin

An unhandled exception has occurred while executing the request. System.ArgumentNullException: Value cannot be null. (Parameter 'buffer')

How to use one appsettings.json file across muilti

How to use one appsettings.json file across muiltiple applications

How to check if string is null before replacing ch

How to check if string is null before replacing charecters in C-Sharp (C#)

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

How to copy data from one table to a new table wit

How to copy data from one table to a new table with primary and foreign keys respected

Software Development Refactoring Wisdom I gained t

Software Development Refactoring Wisdom I gained through Reviewing My Own Code

[Entity Framework Core 5] An Unhandled Exception O

[Entity Framework Core 5] An Unhandled Exception Occurred While Processing the Request

Migrate Existing Asp.Net Web Site to .Net Core

Migrate Existing Asp.Net Web Site to .Net Core

Machine Learning Course Udamy Notes

Machine Learning Course Udamy Notes

InvalidOperationException: The property 'EntityNam

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

Find Out Which Database Contain A Table

Find Out Which Database Contain A Table

NullReferenceException: Object reference not set t

NullReferenceException: Object reference not set to an instance of an object

System.IO.FileNotFoundException: Could not load fi

System.IO.FileNotFoundException: Could not load file or assembly 'System.Runtime.CompilerServices.Unsafe, Version=6.0.0.0, Culture=neutral

InvalidOperationException: There is no ViewData it

InvalidOperationException: There is no ViewData item of type 'IEnumerable<SelectListItem>' that has the key 'Department'

Drupal 8 Bootstrap 4 Not Loading CSS Files

Drupal 8 Bootstrap 4 Not Loading CSS Files

How to get localized string from ASP.NET Core Cont

How to get localized string from ASP.NET Core Controller Work Around

ArgumentException: Affinity key name set on the cl

ArgumentException: Affinity key name set on the cluster 'allclusterprops' must not be null.

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

Linux service returns (code=exited, status=2)

Linux service returns (code=exited, status=2)

[Access,Excel Linked Table Problem] Solved!!

[Access,Excel Linked Table Problem] Solved!!

[AspNet 5 Entity Framework 6 Error] InvalidOperati

[AspNet 5 Entity Framework 6 Error] InvalidOperationException: The property "ModelName.Id" has a temporary value while attempting to change the entity's state to "Modified". Either set a permanent value explicitly, or ensure that the database is configured to generate values for this property.

HTTP Dot Net Core 2.2 Error 500.30 - ANCM In-Proce

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

RuntimeBinderException: 'System.Dynamic.DynamicObj

RuntimeBinderException: 'System.Dynamic.DynamicObject'does not contain a definition for 'Modal'

Asp.Net Core MVC Razor View Form not posting data

Asp.Net Core MVC Razor View Form not posting data to the Server-Side

OverflowException: Value was either too large or t

OverflowException: Value was either too large or too small for an Int32

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

Cassandra Entity Framework Error "TypeLoadExceptio

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

There is no remote user 'distributor_admin' mapped