Solved Solutions to computer programming Errors

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

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_context.ChangeTracker 'threw an exception of type

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_context.ChangeTracker 'threw an exception of type 'System.ObjectDisposedException'

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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.

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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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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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InvalidOperationExecption: The property 'EntityNam

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InvalidOperationExecption: The property 'EntityName.Id' is part of a key and so cannot be modified or marked as modified.

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SqlNullValueException: Data is Null. This method o

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

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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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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)

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SqlException: Conversion failed when converting fr

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SqlException: Conversion failed when converting from a character string to uniqueidentifier

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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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Performance Tuning in Entity Framework Core 5 and

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Performance Tuning in Entity Framework Core 5 and AspNet 5

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Entity Framework Core Error: Unable to track an en

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Entity Framework Core Error: Unable to track an entity of type "Model Class Object" because primary key property 'id' is null

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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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What is domain driven design in Asp.Net 8?

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What is domain driven design in Asp.Net 8?

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InvalidOperationException: An error was generated

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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'.

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[Solved] InvalidOperationException: The entity typ

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[Solved] InvalidOperationException: The entity type 'TableNameOrModelName' requires a primary key to be defined. If you intended to use a keyless entity type call 'HasNoKey()'.

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How to Count the Number of records in the Database

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

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Invalid column name '*_ID'

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Invalid column name '*_ID'

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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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Entity Framework Core Store Procedure with Paramet

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Entity Framework Core Store Procedure with Parameters does not return results (FromSqlRaw)

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An Exception occurred in the database while saving

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

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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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Entity framework "InvalidCastException: Unable to

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

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How to get the last record of Entity Framework mod

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How to get the last record of Entity Framework model data

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[Entity Framework Core 5] An Unhandled Exception O

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

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SqlExeption: Cannot insert explicit value for iden

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SqlExeption: Cannot insert explicit value for identity column in table when IDENTITY_INSERT is set to OFF

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InvalidOperationException: The supplied IQueryable

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InvalidOperationException: The supplied IQueryable is provided by Entity Framework. To query it efficiently, you must reference the package

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The instance of entity type 'IdentityUserLogin<str

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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

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Asp.Net Core Error: InvalidOperationException: The

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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

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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: An error was generated

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InvalidOperationException: An error was generated for warning 'Microsoft.EntityFrameworkCore.Query.InvalidIncludePathError

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_context.SaveChanges is not working

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_context.SaveChanges is not working

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Asp.Net Core 3.1 Entity Framework Core DateTime fi

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Asp.Net Core 3.1 Entity Framework Core DateTime field getting updated to 1/1/0001

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Weird Issues with SQL Server, Visual Studio and En

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Weird Issues with SQL Server, Visual Studio and Entity-Framework

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

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

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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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How to Code a Windows Service that Updates the Dat

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How to Code a Windows Service that Updates the Database Table Nightly

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How to upgrade Asp.Net 5 Application to Asp.Net 6

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How to upgrade Asp.Net 5 Application to Asp.Net 6 Nuget Packages not upgrading

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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

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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

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Asp.Net Core 3.1 2020 Conference Notes

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Asp.Net Core 3.1 2020 Conference Notes

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An Exception was thrown while attempting to evalua

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

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How to optimize sql query in Microsoft SQL Server

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How to optimize sql query in Microsoft SQL Server

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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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"WaitForWarmupCompletion" task was not given a val

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"WaitForWarmupCompletion" task was not given a value for the required parameter of "Configuration"

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[SOLVED!! Entity Framework Error Asp.Net Core 3.1]

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[SOLVED!! Entity Framework Error Asp.Net Core 3.1] InvalidCastException: Unable to cast object of type 'Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryable`

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How to call a store procedure in Entity Framework

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How to call a store procedure in Entity Framework Core 2.2.1 without a Model Generated

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Entity Framework 6

What is Entity Framework Navigation in Asp.Net 6

What is Entity Framework Navigation in Asp.Net 6

Entity Framework Core 6 and 7 Tips and Tricks

Entity Framework Core 6 and 7 Tips and Tricks

InvalidOperation: The connection was not closed. T

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

_context.ChangeTracker 'threw an exception of type

_context.ChangeTracker 'threw an exception of type 'System.ObjectDisposedException'

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.

InvalidOperationException: An exception was thrown

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

InvalidOperationExecption: The property 'EntityNam

InvalidOperationExecption: The property 'EntityName.Id' is part of a key and so cannot be modified or marked as modified.

SqlNullValueException: Data is Null. This method o

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

Microsoft.EntityFrameworkCore.Database.Transaction

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

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)

SqlException: Conversion failed when converting fr

SqlException: Conversion failed when converting from a character string to uniqueidentifier

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

Performance Tuning in Entity Framework Core 5 and

Performance Tuning in Entity Framework Core 5 and AspNet 5

Entity Framework Core Error: Unable to track an en

Entity Framework Core Error: Unable to track an entity of type "Model Class Object" because primary key property 'id' is null

InvalidOperationException: The required column 'Ca

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

What is domain driven design in Asp.Net 8?

What is domain driven design in Asp.Net 8?

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'.

[Solved] InvalidOperationException: The entity typ

[Solved] InvalidOperationException: The entity type 'TableNameOrModelName' requires a primary key to be defined. If you intended to use a keyless entity type call 'HasNoKey()'.

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

Invalid column name '*_ID'

Invalid column name '*_ID'

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

Entity Framework Core Store Procedure with Paramet

Entity Framework Core Store Procedure with Parameters does not return results (FromSqlRaw)

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)

Microsoft Data SqlClient SqlException (0x80131904)

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

Entity framework "InvalidCastException: Unable to

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

How to get the last record of Entity Framework mod

How to get the last record of Entity Framework model data

[Entity Framework Core 5] An Unhandled Exception O

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

SqlExeption: Cannot insert explicit value for iden

SqlExeption: Cannot insert explicit value for identity column in table when IDENTITY_INSERT is set to OFF

InvalidOperationException: The supplied IQueryable

InvalidOperationException: The supplied IQueryable is provided by Entity Framework. To query it efficiently, you must reference the package

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 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

Cassandra Entity Framework Error "TypeLoadExceptio

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

InvalidOperationException: An error was generated

InvalidOperationException: An error was generated for warning 'Microsoft.EntityFrameworkCore.Query.InvalidIncludePathError

_context.SaveChanges is not working

_context.SaveChanges is not working

Asp.Net Core 3.1 Entity Framework Core DateTime fi

Asp.Net Core 3.1 Entity Framework Core DateTime field getting updated to 1/1/0001

Weird Issues with SQL Server, Visual Studio and En

Weird Issues with SQL Server, Visual Studio and Entity-Framework

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

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

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

How to Code a Windows Service that Updates the Dat