What is wrong with this code. Why can't I use SqlConnection?

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I am 100% newbie to SQl and wanted to make a ConsoleApp with the use of database. I read some about it and tried. When I needed to make SqlConnection, my VS 2019 Preview showed me this

Severity Code Description Project File Line Suppression State 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=0.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' Consider adding a reference to that assembly. ConsoleApp1 C:\Users\User\Desktop\Bald Code\ConsoleApp1\ConsoleApp1\Program.cs 12 Active

i don't get why it doesn't work

Here's my code

using System;

using System.Data;

using System.Data.SqlClient;

namespace ConsoleApp1

{

    class Program
    {
        static void Main(string[] args)
        {
            string connectionString;
            SqlConnection cnn;
        }
    }
}

If you just updated EntityFrameworkCore from version 2.x to 3.x and you're running into this, change your using statement to Microsoft.Data.SqlClient instead of System.Data.SqlClient.

If you're using EntityFrameworkCore.SqlServer it already has that as a dependency, so you shouldn't need to install it explicitly.

This Microsoft blog explains the change.

What's wrong with this code?, This is my code but debugger says it has so many wrong codes but I could not exactly understand what debugger says, so, please give me your comments. The specific way to fix this from within VS Code is to . 1) Open a terminal by going to Terminal -> New Terminal. 2) Run dotnet add package System.Data.SqlClient. 3) Run dotnet restore. That last command might not be necessary, but doing this made it work for me. It seems that console app templates don't come prepared for a reference to SqlClient.

Assuming that you're using .NET Core - just add NuGet package: System.Data.SqlClient

Your .csproj might look similar to:

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>netcoreapp2.1</TargetFramework>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="System.Data.SqlClient" Version="4.5.1" />
  </ItemGroup>
</Project>

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The specific way to fix this from within VS Code is to

1) Open a terminal by going to Terminal -> New Terminal

2) Run dotnet add package System.Data.SqlClient

3) Run dotnet restore

That last command might not be necessary, but doing this made it work for me. It seems that console app templates don't come prepared for a reference to SqlClient.

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As @Mmm mentioned in the comments if you are using .NET Core and have already installed the System.Data.SqlClient package, closing and reopening the project resolved the issue for me too.

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looks like you are missing the reference somewhere in your project. It can be the class where you call the database connection method Ex: your CRUD methods

using System.Data.SqlClient;

for more details refer this

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Comments
  • you need to add the System.Data.SqlClient assembly in your project reference.
  • I had a similar problem despite adding the package from NuGet in VS2017. I had to close the project and re-open it for System.Data.SqlClient to be recognized.
  • Do note that a "using" is not the same as a reference