This C# project contains a sample class library that can be generated for using the IBM i Access ODBC Driver in a .Net or .Net Core project. The project compiles to .Net Standard 2.0 which is compatible back to .Net and .Net Core 2.1.
You could also just lift the classes and put into your own source code rather than creating a separate class library. It's up to you.
Rather than worrying about writing ODBC data access code, you can focus on your business logic.
The IBM i Access ODBC drivers can be downloaded from the following IBM site as long as you have an account to log in to the IBM download site.
https://www.ibm.com/support/pages/ibm-i-access-client-solutions
There is an ODBC driver available that runs on Windows, Linux, MacOS and there is also a native IBM i ODBC driver available.
In order to use this connection string you must already have the IBM i Access ODBC Driver installed on your Windows, Linux or Mac computer.
The sample C# connection string variable below connects to a system with IP address: 1.1.1.1 User: user1 Password: pass1
String _conn = "Driver={IBM i Access ODBC Driver};System=1.1.1.1;Uid=user1;Pwd=pass1;CommitMode=0;EXTCOLINFO=1;";
using IbmiOdbcDataAccess;
using System.Data;
using System.Data.Common;
// Connect to system using only system, user and password instead of connection string
var rtnconn = _ibmi.OpenConnection("1.1.1.1", "user1", "pass1");
// Execute SQL query to results DataTable
var _dtable1 = _ibmi.ExecuteQueryToDataTable ("SELECT * FROM QIWS.QCUSTCDT");
// Iterate and output desired columns to console
foreach(DataRow _row in _dtable1.Rows)
{
Console.WriteLine($"Cusnum:{_row["CUSNUM"]} Lastname:{_row["LSTNAM"]} Init:{_row["INIT"]}");
}