获取ASP.NET中动态添加的控件的值

hello everyone thank you so much for providing help to me for my previous question as I'm developing application for education domain. In that I take panel control as panel1 and define a few dropdownlist controls in that panel as dropdown1, dropdown2 etc. dynamically in button1 click event and i want to use those controls' values in button2 click event help me for the same.hello everyone thank you so much for providing