I want to relate 2 listBoxes. Although during the filling of the first
listBox1; the event SelectedIndexChanged already fires (this is not the
purpose). The event should only fire when a select an item in listBox1.
How can i avoid that the event fires too early?

...
private void button3_Click(object sender, System.EventArgs e)
{

DataSet ds = new DataSet();

DataAdapter da = null;

string SQLcom = "SELECT toto, id FROM table";

da = new DataAdapter(SQLcom, conn);

da.Fill(ds, "table");

listBox1.DataSource = ds.Tables["table"];

listBox1.ValueMember = "id";

listBox1.DisplayMember = "toto";

listBox1.SelectedIndex = -1;

}

private void listBox1_SelectedIndexChanged(object sender, System.EventArgs
e)

{

DataSet ds = new DataSet();

DataAdapter da = null;

string SQLcom = "SELECT tata, id FROM table2";

da = new DataAdapter(SQLcom, conn);

da.Fill(ds, "table2");

listBox2.DataSource = ds.Tables["table2"];

listBox2.ValueMember = "id";

listBox2.DisplayMember = "tata";

listBox2.SelectedIndex = -1;

}