user control inside a parent on button click a pop up opens which is yet another page having user control

See more:

.NET

hi everybody ,
this is my first post ever on code project so please help me out ,
I am having a parent page create Items in which a user control ucCreateItems is opened which contains a dropdown list of categories ,
on a button click of this user control a new pop up opens called PopUpCreate categories opens
which is an aspx page in which a user control ucCreateCategories is opened where we can create new categories .When a category is created through a pop up,i want that the dropdown list of the first page create item is populated and newly created category is selected automatically, so a little help about how to get the control (dropdown list ) of first usercontrol be get in the pop up user control so that i cam bind it dynamically .

here is the code----->>>>>

protected void Page_Load(object sender, EventArgs e)
     {
         try
         {
            // (DropDownList)DropDownListCategory = (DropDownList)Parent.FindControl("");
             objItem.CompanyId = objcategory.CompanyId = Convert.ToInt64(Session["LoginCompanyId"]);

             if (!Page.IsPostBack)
             {
                 BindItemUnit();

                 //  this.AddNodes(this.TreeviewCategories.Nodes, 0, objcategory.GetCategories());
                 DataTable CategoriesDropDownFill = objcategory.GetCategories();
                 DropDownListCategory.DataSource = CategoriesDropDownFill;
                 DropDownListCategory.DataTextField = "CategoryName";
                 DropDownListCategory.DataValueField = "CategoryId";
                 DropDownListCategory.DataBind();
                 DropDownListCategory.Items.Insert(0, new ListItem("-Select-", 0.ToString()));
                 if (Request.QueryString["ItemId"] != null)
                 {
                     H1Text.InnerHtml = "Edit item";
                     GetItemDetail();

                 }
                 else
                 {
                     H1Text.InnerHtml = "New item";
                 }
                 LabelCurrency.Text = LabelCurrency2.Text = Session["currencyName"].ToString();

             }
         }
         catch (Exception ex)
         {
             objErrorLog.InsErrorLog(ex.Message.ToString(), "~/Master/Items/CreateItem.aspx", "Page_Load()",
                 Convert.ToInt32(Session["LoginUserId"]));
         }
     }
     public void BindItemUnit()
     {
         ItemUnit objitemunit = new ItemUnit();
         objitemunit.CompanyId = Convert.ToInt64(Session["LoginCompanyId"]);
         var listUnit = objitemunit.FillUnits().ToList();
         DropDownListUnit.DataSource = listUnit;
         DropDownListUnit.DataTextField = "Unit";
         DropDownListUnit.DataValueField = "UnitId";
         DropDownListUnit.DataBind();
         DropDownListUnit.Items.Insert(0, new ListItem("-Select-", 0.ToString()));
     }

Here i want to get the control of the create item user control

protected void ButtonSave_Click(object sender, EventArgs e)
   {
       try
       {
           if (Request.QueryString["Id"] != null)
           {
               objCategory.CategoryId = Convert.ToInt32(Request.QueryString["Id"].ToString());

           }
           objCategory.ParentId = Convert.ToInt64(DropDownListParentCategory.SelectedValue);
           objCategory.CategoryName = TextBoxCategoryName.Text;
           objCategory.Description = TextBoxDescription.Text;
           objCategory.CreatedBy = Convert.ToInt32(Session["LoginUserId"]);
           objCategory.LastModifiedBy = Convert.ToInt32(Session["LoginUserId"]);
           objCategory.CompanyId = Convert.ToInt64(Session["LoginCompanyId"]);

           if (objCategory.IsExist() > 0)
           {
               LabelMsg.Text = "Category with same name already Exist.";
           }

           else
               if (objCategory.AddUpdateNewCategory() > 0)
               {
                   if (Request.QueryString["Type"]!=null)
                   {
                       HiddenFieldLastInsertedDropDownValue.Value = objCategory.AddUpdateNewCategory().ToString();
                       string script = "BinducCreateItemDropDown();";
                       ScriptManager.RegisterStartupScript(this, this.GetType(), "BinducCreateItemDropDown", script, true);
                   }
                   else
                   {
                       string script = "Redirect();";
                       ScriptManager.RegisterStartupScript(this, this.GetType(), "Redirect", script, true);
                   }
               }

       }

if (Request.QueryString["Type"]!=null)
                       {
                           HiddenFieldLastInsertedDropDownValue.Value = objCategory.AddUpdateNewCategory().ToString();
                           string script = "BinducCreateItemDropDown();";
                           ScriptManager.RegisterStartupScript(this, this.GetType(), "BinducCreateItemDropDown", script, true);
                       }

its here i want to get the control dropdown list categories