ComboBox displaymember select

Hello,

In my application i have a combobox populated from database:

Program.Connection.CommandText = "SELECT LastName + ', ' + FirstName + ' ' + IIF(MiddleName, MiddleName,'') AS NumeComplet, ClientId FROM Clients GROUP BY ClientId, LastName, FirstName, MiddleName ORDER BY ClientId";
            DataTable Table = new DataTable();
            Program.Connection.FillDataTable(Table, true);
            cboNumeClient.DataSource = Table;
            cboNumeClient.DisplayMember = "NumeComplet";
            cboNumeClient.ValueMember = "ClientId";
            cboNumeClient.Focus();
            NumeClient();
            ClientiAdaugati = true;
            InformatiiClient();

and a selected index event:

private void cboNumeClient_SelectedIndexChanged(object sender, EventArgs e)
       {
           if (this.ClientiAdaugati)
           {
               NumeClient();
               InformatiiClient();
           }
       }

In the database i have customers with the same first name and last name, each one have it's own ID.

When i select i client i use the ID to populate a datagridview.

The problem is:

For example the:
client John John - ID - 2345, and
client John John - ID - 2390.

When i select the second name (id - 2390) from combobox, my datagridview fill whit according data, but when i click on a control from my windows, my combobox auto select the firs client (id 2345).

How do i resolve that?

Tags: C#