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Write release notes for 6.1.5 (#4169)
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‎CHANGELOG.md‎

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The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
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7-
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> **Note:** Releases are sorted in reverse chronological order (newest first).
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## [Preview Release 7.1.0-preview1] - 2026-04-29
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- Fixed a `NullReferenceException` in `SqlDataReader`.
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([#4159](https://github.com/dotnet/SqlClient/pull/4159))
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## [Stable Release 6.1.5] - 2026-04-27
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This update brings the following changes since the [6.1.4](release-notes/6.1/6.1.4.md) release.
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See the [full release notes](release-notes/6.1/6.1.5.md) for target platform support and dependency information.
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### Fixed
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- Fixed a connection performance regression where SPN (Service Principal Name) generation was triggered for non-integrated authentication modes (e.g., SQL authentication) on the native SNI path, causing unnecessary DNS lookups and significantly slower connection times.
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([#3523](https://github.com/dotnet/SqlClient/issues/3523), [#3946](https://github.com/dotnet/SqlClient/pull/3946))
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- Fixed `ExecuteScalar` to properly propagate errors when the server sends data followed by an error token. Previously, errors such as conversion failures during `WHERE` clause evaluation were silently consumed during `SqlDataReader.Close()` instead of being thrown to the caller, which could result in transactions being unexpectedly zombied.
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([#3736](https://github.com/dotnet/SqlClient/issues/3736), [#3947](https://github.com/dotnet/SqlClient/pull/3947))
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- Fixed `SqlDataReader.GetFieldType` and `SqlDataReader.GetProviderSpecificFieldType` to return the correct type (`SqlVector<float>`) for vector float32 columns.
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([#4104](https://github.com/dotnet/SqlClient/issues/4104), [#4151](https://github.com/dotnet/SqlClient/pull/4151))
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## [Stable Release 7.0.1] - 2026-04-23
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This update brings the following changes since the [7.0.0](release-notes/7.0/7.0.0.md) release.

‎release-notes/6.1/6.1.5.md‎

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# Release Notes
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## Stable Release 6.1.5 - 2026-04-27
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This update brings the following changes since the [6.1.4](6.1.4.md) release:
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### Fixed
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- Fixed a connection performance regression where SPN (Service Principal Name) generation was triggered for non-integrated authentication modes (e.g., SQL authentication) on the native SNI path, causing unnecessary DNS lookups and significantly slower connection times.
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([#3523](https://github.com/dotnet/SqlClient/issues/3523), [#3946](https://github.com/dotnet/SqlClient/pull/3946))
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- Fixed `ExecuteScalar` to properly propagate errors when the server sends data followed by an error token. Previously, errors such as conversion failures during `WHERE` clause evaluation were silently consumed during `SqlDataReader.Close()` instead of being thrown to the caller, which could result in transactions being unexpectedly zombied.
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([#3736](https://github.com/dotnet/SqlClient/issues/3736), [#3947](https://github.com/dotnet/SqlClient/pull/3947))
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- Fixed `SqlDataReader.GetFieldType` and `SqlDataReader.GetProviderSpecificFieldType` to return the correct type (`SqlVector<float>`) for vector float32 columns. Previously, these methods did not follow the same type-resolution logic as `GetValue`, returning an incorrect type for vector columns.
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([#4104](https://github.com/dotnet/SqlClient/issues/4104), [#4151](https://github.com/dotnet/SqlClient/pull/4151))
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## Target Platform Support
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- .NET Framework 4.6.2+ (Windows x86, Windows x64, Windows ARM64)
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- .NET 8.0+ (Windows x86, Windows x64, Windows ARM64, Linux, macOS)
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- .NET Standard 2.0+ (Windows x86, Windows x64, Windows ARM64, Linux, macOS)
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### Dependencies
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#### .NET Framework 4.6.2
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- Azure.Core 1.50.0
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- Azure.Identity 1.17.1
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- Microsoft.Data.SqlClient.SNI 6.0.2
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- Microsoft.Extensions.Caching.Memory 8.0.1
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- Microsoft.Identity.Client 4.80.0
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- Microsoft.IdentityModel.JsonWebTokens 7.7.1
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- Microsoft.IdentityModel.Protocols.OpenIdConnect 7.7.1
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- System.Buffers 4.6.1
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- System.Data.Common 4.3.0
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- System.Diagnostics.DiagnosticSource 8.0.1
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- System.IdentityModel.Tokens.Jwt 7.7.1
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- System.Memory 4.6.3
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- System.Security.Cryptography.Pkcs 8.0.1
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- System.Text.Json 8.0.6
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- System.Text.RegularExpressions 4.3.1
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#### .NET 8.0
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- Azure.Core 1.50.0
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- Azure.Identity 1.17.1
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- Microsoft.Data.SqlClient.SNI.runtime 6.0.2
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- Microsoft.Extensions.Caching.Memory 8.0.1
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- Microsoft.Identity.Client 4.80.0
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- Microsoft.IdentityModel.JsonWebTokens 7.7.1
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- Microsoft.IdentityModel.Protocols.OpenIdConnect 7.7.1
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- Microsoft.SqlServer.Server 1.0.0
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- System.Configuration.ConfigurationManager 8.0.1
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- System.Diagnostics.DiagnosticSource 8.0.1
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- System.IdentityModel.Tokens.Jwt 7.7.1
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- System.Security.Cryptography.Pkcs 8.0.1
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#### .NET 9.0
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- Azure.Core 1.50.0
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- Azure.Identity 1.17.1
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- Microsoft.Data.SqlClient.SNI.runtime 6.0.2
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- Microsoft.Extensions.Caching.Memory 9.0.11
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- Microsoft.Identity.Client 4.80.0
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- Microsoft.IdentityModel.JsonWebTokens 7.7.1
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- Microsoft.IdentityModel.Protocols.OpenIdConnect 7.7.1
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- Microsoft.SqlServer.Server 1.0.0
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- System.Configuration.ConfigurationManager 9.0.11
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- System.Diagnostics.DiagnosticSource 9.0.11
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- System.IdentityModel.Tokens.Jwt 7.7.1
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- System.Security.Cryptography.Pkcs 9.0.11
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#### .NET Standard 2.0
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- Azure.Core 1.50.0
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- Azure.Identity 1.17.1
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- Microsoft.Data.SqlClient.SNI.runtime 6.0.2
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- Microsoft.Extensions.Caching.Memory 8.0.1
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- Microsoft.Identity.Client 4.80.0
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- Microsoft.IdentityModel.JsonWebTokens 7.7.1
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- Microsoft.IdentityModel.Protocols.OpenIdConnect 7.7.1
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- Microsoft.SqlServer.Server 1.0.0
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- System.Configuration.ConfigurationManager 8.0.1
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- System.Diagnostics.DiagnosticSource 8.0.1
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- System.IdentityModel.Tokens.Jwt 7.7.1
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- System.Security.Cryptography.Pkcs 8.0.1
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- System.Text.Json 8.0.6

‎release-notes/6.1/README.md‎

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| Release Date | Version | Notes |
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| :-- | :-- | :--: |
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| 2026-04-27 | 6.1.5 | [Release Notes](6.1.5.md) |
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| 2026-01-15 | 6.1.4 | [Release Notes](6.1.4.md) |
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| 2025-11-12 | 6.1.3 | [Release Notes](6.1.3.md) |
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| 2025-10-07 | 6.1.2 | [Release Notes](6.1.2.md) |

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