adding dynamic buttons to panel

Your original code works fine for me without any change: the most likely hypotheses for what you observe are:

1. you have not added the Panel to the Form's ControlCollection, or some other valid, and visible, ContainerControl, inside the Form.

2. or, you set the Panel's 'Visible Property to 'false.

i used FlowLayoutPanel and TableLayoutPanel .it solved my problem.
no need to do anything else...

int basex = panel1.Location.X;
   int basey = panel1.Location.Y;
   for (int i = 0; i < 5; i++)
   {
       Button b = new Button();
       b.Left = basex;
       b.Top = basey;
       basey += 50;
       b.Name = String.Format("btnDriver{0}", i + 1);
       b.Text = String.Format("btnDriver{0}", i + 1);
       b.Click += new EventHandler(b_Click);
       flowLayoutPanel1.Controls.Add(b);
   }

Take Panel control in your .aspx page and after that write code on code behind Page_Load event
as like:

protected void Page_Load(object sender, EventArgs e)
    {
        Button b = new Button();
        //form1.Controls.Add(b);
        Panel1.Controls.Add(b);
        b.Text = "Click";
        b.Click+=new EventHandler(b_Click);
    }

It's working properly......If you getting any problem tell me will solve easily.....:-)

Because of wrong location button is not visible.
The location of the button you have set according to form (which is not buttons parent). You should add location with respect to Panel. Just to test you can add the location as (5,5).Then your button will be visible on Panel.