dotnet/SqlClient

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Microsoft.Data.SqlClient provides database connectivity to SQL Server for .NET applications.

Stars: 989
Forks: 340
Open beginner issues: 0
Indexed issues: 241
Avg merge: 4d 19h
Merged PRs (30d): 72

Dominant language: C#
License: MIT
Last GitHub push: Sep 14, 2026
Latest indexed: Sep 15, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

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240 open issues indexed

Cannot connect to (localdb) from .NET Core except via Named Pipe on Windows 11 ARM Open

External :link:

dotnet/SqlClient#1441 · 32 comments · 7 reactions · 0 assignees · Indexed Sep 15, 2026
ExecuteXmlReader uses XmlReaderSettings that are incompatible with SQL Server Open

Repro Available :heavy_check_mark:

dotnet/SqlClient#1445 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
SqlDataReader.GetXmlReader(int) returns unusable reader rather than throwing on DBNull Open

Breaking Change :hammer: Repro Available :heavy_check_mark:

dotnet/SqlClient#1459 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
SqlCommand retry after transaction abort can partially save data to database Open

Up-for-Grabs :raised_hands:

dotnet/SqlClient#1509 · 4 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Intermittent EF Core/Azure SQL Connection Issues Open

dotnet/SqlClient#1527 · 26 comments · 7 reactions · 0 assignees · Indexed Sep 15, 2026
Intermittent Unknown error 258 with no obvious cause Open

Area\Managed SNI Performance :chart_with_upwards_trend:

dotnet/SqlClient#1530 · 123 comments · 40 reactions · 0 assignees · Indexed Sep 15, 2026
Consider not doing a roundtrip for BeginTransaction Open

Performance :chart_with_upwards_trend:

dotnet/SqlClient#1554 · 19 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Huge performance problem with async Open

Area\Async Performance :chart_with_upwards_trend: Repro Available :heavy_check_mark:

dotnet/SqlClient#1562 · 14 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Sql image data type can't be mapped to SqlBinary in System.Data.SqlTypes Open

Repro Available :heavy_check_mark:

dotnet/SqlClient#1573 · 8 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
When server is unreachable, CancellationToken does not cancel the automatical retries Open

dotnet/SqlClient#1619 · 7 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
SqlStream and SqlCachedStream should consider overriding Span Read/Write methods Open

Performance :chart_with_upwards_trend:

dotnet/SqlClient#1628 · 1 comment · 3 reactions · 0 assignees · Indexed Sep 15, 2026
Custom AAD token provider in Winforms can still deadlock in GetFedAuthInfo Open

dotnet/SqlClient#1630 · 12 comments · 2 reactions · 1 assignee · Indexed Sep 15, 2026
Provide mechanism for checking if custom column encryption provider has been registered Open

dotnet/SqlClient#1642 · 8 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Microsoft.Data.SqlClient is not compatible with AssemblyLoadContext unloading Open

dotnet/SqlClient#1687 · 8 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
ExecuteReaderAsync hangs when Column Encryption is enabled and the worker usage of Azure DB is 100% Open

Repro Available :heavy_check_mark:

dotnet/SqlClient#1762 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
"Internal connection fatal error" when connecting from a docker container Open

Repro Available :heavy_check_mark:

dotnet/SqlClient#1774 · 3 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
clang linker error after including Microsoft.Data.SqlClient nuget in project Open

Repro Available :heavy_check_mark:

dotnet/SqlClient#1816 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
WriteCommandError diagnostic event missing when using ExecuteReader when an OUTPUT clause is present Open

Repro Available :heavy_check_mark: Up-for-Grabs :raised_hands:

dotnet/SqlClient#1839 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Expose MSAL logs to the application Open

Approved

dotnet/SqlClient#1846 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Remark on SqlConnectionStringBuilder.ShouldSerialize method is not universally true. Open

Area\Documentation

dotnet/SqlClient#1851 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
While cancelling a query SqlClient might throw an exception even though the query successfully executed Open

Repro Available :heavy_check_mark:

dotnet/SqlClient#1853 · 22 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
ef core7 , RemoteCertificateValidationCallback error was throwd in docker container Open

dotnet/SqlClient#1856 · 30 comments · 6 reactions · 0 assignees · Indexed Sep 15, 2026
SqlDataAdapter.Fill(DataTable) does not detect re-raised error from SQL Server Open

Repro Available :heavy_check_mark: System.Data.SqlClient :older_man:

dotnet/SqlClient#1876 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
O(N^2) performance when reading XML with SequentialAccess Open

Performance :chart_with_upwards_trend: Repro Available :heavy_check_mark:

dotnet/SqlClient#1877 · 4 comments · 0 reactions · 2 assignees · Indexed Sep 15, 2026
SqlException within concurrent call to ExecuteReader returns bad connections to the pool Open

dotnet/SqlClient#1887 · 8 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Add support for MSAL Token Cache persistence with Azure authentication Open

dotnet/SqlClient#1895 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Kerberos Auth Fails In Linux When Using a Bind DNS Backend. Open

External :link:

dotnet/SqlClient#1899 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Feature | Error messages are not meaningful when target SQL server doesn't support 'Strict' encryption mode Open

Up-for-Grabs :raised_hands:

dotnet/SqlClient#1905 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 15, 2026
SqlException.Number is always 0 when using .NET framework remoting Open

Repro Available :heavy_check_mark:

dotnet/SqlClient#1940 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Improve binary size when using NativeAOT Open

Up-for-Grabs :raised_hands:

dotnet/SqlClient#1942 · 13 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
NativeAOT support: get to zero warnings Open

Up-for-Grabs :raised_hands:

dotnet/SqlClient#1947 · 9 comments · 5 reactions · 1 assignee · Indexed Sep 15, 2026
Microsoft.Data.SqlClient.SNI not deployed in "Website" projects Open

Area\Native SNI

dotnet/SqlClient#1955 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Consider handling error code 40613 with stretched timeout with default retry logic provider Open

dotnet/SqlClient#1957 · 6 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Intermittent SqlException A connection was successfully established with the server, but then an error occurred during the pre-login handshake Open

Intermittent :fearful:

dotnet/SqlClient#2005 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
TDSParser Error Open

Area\Native SNI

dotnet/SqlClient#2022 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Microsoft.data.sqlclient issue with executeReader() Open

Repro Available :heavy_check_mark:

dotnet/SqlClient#2027 · 8 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Bug in SQL Server provider when using UTF8 collations Open

Repro Available :heavy_check_mark:

dotnet/SqlClient#2035 · 14 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
The CancellationToken in a TaskCanceledException on ToListAsync does not match Open

dotnet/SqlClient#2037 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Consider error diagnostic when SqlClient used when invariant globalization enabled. Open

Up-for-Grabs :raised_hands:

dotnet/SqlClient#2043 · 5 comments · 6 reactions · 0 assignees · Indexed Sep 15, 2026
SqlClient truncates double values used in parameters Open

Repro Available :heavy_check_mark:

dotnet/SqlClient#2051 · 5 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Unable to load 5.1.1 DLL 'Microsoft.Data.SqlClient.SNI.x64.dll' : The specified module could not be found. Open

Area\Native SNI

dotnet/SqlClient#2049 · 14 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
The Active Directory Interactive login redirect to localhost on .net6 iOS Open

dotnet/SqlClient#2062 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Could not load file or assembly 'System.Memory, Version=4.0.1.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' or one of its dependencies. Open

Repro Available :heavy_check_mark:

dotnet/SqlClient#2082 · 20 comments · 3 reactions · 0 assignees · Indexed Sep 15, 2026
DllNotFoundException for Microsoft.Data.SqlClient.SqlConnection.Open on .NET8 preview 5 when used in COM component loaded in default ALC Open

Area\Native SNI Repro Available :heavy_check_mark:

dotnet/SqlClient#2083 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
DateOnly Output SqlParameter Open

dotnet/SqlClient#2092 · 10 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
A transport-level error has occurred when receiving results from the server. (provider: TCP Provider, error: 35 - An internal exception was caught) Open

dotnet/SqlClient#2103 · 27 comments · 11 reactions · 1 assignee · Indexed Sep 15, 2026
"A task was canceled." using Active Directory Default authentication in connection string Open

Repro Available :heavy_check_mark:

dotnet/SqlClient#2105 · 20 comments · 8 reactions · 0 assignees · Indexed Sep 15, 2026
Implement SqlDataSource Open

dotnet/SqlClient#2119 · 9 comments · 9 reactions · 0 assignees · Indexed Sep 15, 2026
Error info is lost during serialization Open

dotnet/SqlClient#2150 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Possible lock contention/thread pool starvation when acquiring access token causing timeout exceptions Open

dotnet/SqlClient#2152 · 15 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026

dotnet/SqlClient

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