Web Reference: Jan 30, 2019 · The Reason for this error is that the namespace System.Data.SqlClient will not be referenced by the .NET Core project by default as done by .NET Framework, So, in .NET Core, you have to manually add the package to the project. Jun 8, 2021 · Error CS1069 The type name ‘SqlConnection’ could not be found in the namespace ‘System.Data.SqlClient’. This type has been forwarded to assembly ‘System.Data.SqlClient, Version=4.6.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a’ Consider adding a reference to that assembly. Dec 21, 2025 · Whether you use the legacy System.Data.SqlClient or the modern Microsoft.Data.SqlClient, the steps are similar. Now that you’ve fixed the error, you’re ready to start working with SQL Server in your console app!
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