How to find HTML control in code behind

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ASP.NET

WebForms

ASP.NET4

Hi,

I am using asp.net web from and creating dynamic controls using javascript but not able to find control using their name.

What I have tried:

var files = Request.Files;
                
                List<string> Settlement_Offer_Details = files.AllKeys.Where(n => n.StartsWith("fileSO")).ToList();
                Settlement_Offer_Details.Add(fileSO.Name);

                foreach (var item in Settlement_Offer_Details)
                {
                    ContentPlaceHolder content = Page.Master.FindControl("MainContent") as ContentPlaceHolder;
                    FileUpload fu = content.FindControl(item) as FileUpload;
                    //FileUpload tb = FindControl(item) as FileUpload;
                }

Using below code able to got details of file but want to know their control name as we are using dynamic creation for 2 different panels .So, it's necessary to know from where this data is coming either from panel 1 or panel2

for (int i = 0; i < Request.Files.Count; i++)
                {
                    HttpPostedFile PostedFile = Request.Files[i];
if (PostedFile.ContentLength > 0)
                    {
                        string FileName = System.IO.Path.GetFileName(PostedFile.FileName);
                        PostedFile.SaveAs(Server.MapPath("Files\\") + FileName);
                    }
                }