void File_Insert(object sender, DragEventArgs e)
{
e.Effect = DragDropEffects.Copy;
var files = (string[])e.Data.GetData(DataFormats.FileDrop);
string[] full_path = files[0].Split('\\');
Label l1 = new Label();
l1.Width = 185;
l1.Height = 15;
l1.Top = 4;
l1.Left = 4;
l1.BackColor = Color.Transparent;
l1.ForeColor = Color.RoyalBlue;
l1.Text = full_path[full_path.Length - 1];
l1.Font = new Font("Cambria", 9, FontStyle.Italic);
l1.Visible = true;
// panel3.Enabled = true;
panel3.Controls.Add(l1);
String resp = req.wifi_info_api("1", "2", "32:23:23:23:23:23", "4");
MessageBox.Show(resp);
}