Get a SqlConnection from a DbContext

DbContextToSqlConnection.cs

private SqlConnection GetSqlConnection(DbContext dbContext)
{
    var ec = dbContext.Database.Connection;
    var adoConnStr = ec.ConnectionString;
    return new SqlConnection(adoConnStr);
    
} 

OR Get a SqlConnection from a DbContext

public class TBill_DbConnect : DbContext
{
SqlConnection conn;

    public TBill_DbConnect()
        : base("name=dbConnection")
    {
        try
        {
            conn = this.Database.Connection as SqlConnection; 
        }
        catch (Exception e)
        {
            throw new Exception(e.Message);
        }
    }

And In .Net 5?