获取多个用户控件中多个子控件的值

public Control [] uc;
public string [] str;
str = new string[5];
uc = new Control[5];
            for(i=0;i<5;++i)
            {                
                uc[i] = LoadControl("test.ascx");
                uc[i].ID = "uc" + i.ToString();
                waite.Controls.Add(uc[i]);        
                
                Response.Write(String.Format("{0},{1},{2}", uc.ID, uc.ClientID, uc.UniqueID));
                Page.Response.Write("<br>");
                
            }

for(i=0;i<5;++i)
            {                    
                
                str[i] += ((TextBox)(uc[i].FindControl("txtGJMC"))).Text.ToString() + "','";    
                
            }