Probably, you've forgot to add a new item:
while (reader.Read())
{
int sira = listView1.Items.Count;
listView1.Items.Add("Put some text here"); // <- Add a new item
listView1.Items[sira].SubItems.Add(reader.GetString("id"));
listView1.Items[sira].SubItems.Add(reader.GetString("ad"));
listView1.Items[sira].SubItems.Add(reader.GetString("soyad"));
listView1.Items[sira].SubItems.Add(reader.GetString("evrakulastimi"));
listView1.Items[sira].SubItems.Add(reader.GetString("basvurusonuclandimi"));
}