I have here a method inside a class called PurchaseOrder. Here, I used `List<string>` to retrieve a list of suppliers and populate these lists in a combo box. The code actually works, but as I add more and more suppliers in my SQL Server database, I have been experiencing a little slowdown on the forms being loaded. How could I optimize such speed?

Below are two sets of codes, the method PopulateSuppliers() from PurchaseOrderClass.cs and a Form\_Load event.

```
    public object PopulateSuppliers()
    {
        //Create an instance of a List of Strings.
        List<string> ListOfSuppliers = new List<string>();

        string sqlString = "SELECT CompanyName FROM tbl_suppliers WHERE Archived = 'False';";

        SqlConnection sqlConnection = new SqlConnection(connectionString);
        SqlCommand sqlCommand = new SqlCommand(sqlString, sqlConnection);

        sqlConnection.Open();
        sqlReader = sqlCommand.ExecuteReader();

        while (sqlReader.Read())
        {
            ListOfSuppliers.Add(sqlReader["CompanyName"].ToString());
        }

        sqlReader.Close();
        sqlConnection.Close();

        return ListOfSuppliers;
    }

    private void frmPurchaseOrderEditor_Load(object sender, EventArgs e)
    {
        ...

        //Populate a list of suppliers.
        cboSuppliers.DataSource = PurchaseOrder.PopulateSuppliers();

        ...
    }

```