using IronXL;
using System.Data;
using System.Data.SqlClient;

// Your sql query
string sql = "SELECT * FROM Users";

// Your connection string
string connectionString = @"Data Source=.\SQLEXPRESS;Initial Catalog=usersdb;Integrated Security=True";

using (SqlConnection connection = new SqlConnection(connectionString))
{
    // Open connections to the database
    connection.Open();
    SqlDataAdapter adapter = new SqlDataAdapter(sql, connection);
    DataSet ds = new DataSet();
    // Fill DataSet with data
    adapter.Fill(ds);

    // Create an Excel workbook from the SQL DataSet
    WorkBook workBook = WorkBook.Load(ds);
}

Imports IronXL
Imports System.Data
Imports System.Data.SqlClient

' Your sql query
Private sql As String = "SELECT * FROM Users"

' Your connection string
Private connectionString As String = "Data Source=.\SQLEXPRESS;Initial Catalog=usersdb;Integrated Security=True"

Using connection As New SqlConnection(connectionString)
	' Open connections to the database
	connection.Open()
	Dim adapter As New SqlDataAdapter(sql, connection)
	Dim ds As New DataSet()
	' Fill DataSet with data
	adapter.Fill(ds)

	' Create an Excel workbook from the SQL DataSet
	Dim workBook As WorkBook = WorkBook.Load(ds)
End Using