How can I fill a Combobox in a datagridview from db mysql

Hello, I have a datagridview which has a combobox.

I want to populate this comboboxes at runtime. But I don't know how.

In the database I have:

So what I need is to show in my combobox for Name a : (1 - 2019) (4 - 2015)

These two must be filled in the combobox.

For Name b the combobox will be : (2 - 2018)

But what I get is that my combobox is filling all the data not only what I need

The code I tried:

using (MySqlDataAdapter sda = new MySqlDataAdapter(@"SELECT DISTINCT Name ,CONCAT(Quantite ,'PCS -' ,Date) as Conc FROM articles", MyConnexion))
{
DataTable dt = new DataTable();
sda.Fill(dt);
DTG_Bordereau.AutoResizeColumns(DataGridViewAutoSizeColumnsMode.AllCells);
DTG_Bordereau.Columns[0].DataPropertyName = "Name";
DTG_Bordereau.Columns[3].Width = 300;
DTG_Bordereau.DataSource = dt;
for (int i = 0; i < dt.Rows.Count; i++)
{
var val = dt.Rows[i]["Conc"].ToString();
//check if it already exists
if (!QuantiteDisponible.Items.Contains(val))
{
QuantiteDisponible.Items.Add(val);
}
}