Initially my ListView shows blank

Question

private void ListBox1_SelectedIndexChanged(object sender, EventArgs e)

{

listView1.Items.Clear();

Approved = false;

string connString = "Data Source=LAPTOP-JTLIEU9Q\\SQLEXPRESS;Initial Catalog=Stores;User ID=sa;Password=Afula1964";

SqlConnection sqlConn = new SqlConnection(connString);

SqlDataAdapter sqlDA = new SqlDataAdapter("spOrderDetails", sqlConn);

sqlDA.SelectCommand.CommandType = CommandType.StoredProcedure;

sqlDA.SelectCommand.Parameters.Add("@OrderID", SqlDbType.VarChar).Value = listBox1.SelectedItem;

DataTable dtSearchResult = new DataTable();

sqlDA.Fill(dtSearchResult);

int fc = dtSearchResult.Columns.Count;

foreach (DataRow row in dtSearchResult.Rows)

{

string[] subitems = new string[fc+1];

object[] o = row.ItemArray;

for (int i = 0; i < fc+1; i++)

{

if (i == 0)

{

subitems[i] = "";

Approved = true;

}

else

{

subitems[i] = o[i-1].ToString();

}

}

if (subitems[4] == "True")

{

subitems[4] = "Yes";

}

else

{

subitems[4] = "No";

}

ListViewItem item = new ListViewItem(subitems);

listView1.Items.Add(item);

}

if (fc > 0)

{

button1.Enabled = true;

}

}