Configuring a connection string in a .NET Core 6 application involves a few steps. Here's a simple guide on how to do it:

Add Configuration to appsettings.json: Open your appsettings.json file and add a section for your connection string. For example:

{
  "ConnectionStrings": {
    "DefaultConnection": "Server=myServerAddress;Database=myDataBase;User=myUsername;Password=myPassword;"
  },
  // other configurations...
}

Replace the values with your actual database server information.

Access Connection String in Code: In your code, you can access the connection string using the Configuration object. For example, in a Startup.cs file:

using Microsoft.Extensions.Configuration;

// ...

public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    // ...
}

Inject Connection String into Services: If you need to use the connection string in services, you can inject it. For example, in Startup.cs:

services.AddDbContext<MyDbContext>(options =>
    options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));

Adjust MyDbContext and the database provider (UseSqlServer in this case) according to your needs.

Use Connection String in Controllers or Services: Now, you can use the configured connection string in your controllers or services. For example:

using Microsoft.Extensions.Configuration;

// ...

public class MyController : ControllerBase
{
    private readonly IConfiguration _configuration;

    public MyController(IConfiguration configuration)
    {
        _configuration = configuration;
    }

    public IActionResult MyAction()
    {
        var connectionString = _configuration.GetConnectionString("DefaultConnection");
        // Use the connection string as needed.
        return Ok("Connection string configured successfully!");
    }
}

This provides a basic guide to configuring and using connection strings in a .NET Core 6 application. Adjust the examples according to your project structure and requirements. If you have a specific scenario or need more details, feel free to ask!