Sorry for the ugly code, but this post helped me the last way - i had the same problem:
[code=cpp]
ScriptManager manager = new ScriptManager() ;
form1.Controls. Add(manager);

Label label_a_head = new Label();
label_a_head.Te xt = "Label A Head";
Label label_a_content = new Label();
label_a_content .Text = "Label A Content";

...