How do you update the controls in a panel on tab pages from the data structure to show the correct content?

//ADDING A NEW WEEK TO TABS
        private void btnAddWeek_Click_1(object sender, EventArgs e)
        {
            // create a new TabPage
            TabPage newTP = new TabPage();
            //Add it to the TabControl
            tabControl1.TabPages.Add(newTP);

            
           
            // Set the title (here "Week" plus the tab page number: 1 ,2 ,3, etc)
            int TabPageNumber = tabControl1.SelectedIndex + 1; // +1 one up from current
            tabControl1.TabPages[TabPageNumber].Text = "Week " + (TabPageNumber + 1);

            // Make it active (bring to the front of all other tab pages)
            tabControl1.SelectTab(TabPageNumber);
           btnDeleteWeek.Enabled = true; // We now have something to delete
          
          
            // Make the new tab page the parent of the Panel that hold all the controls
            panel1.Parent = tabControl1.SelectedTab;  

          

            // update your data structure with default values
            ShowData();
        }


        //CHANGING BETWEEN TABS
        private void tabControl1_SelectedIndexChanged(object sender, EventArgs e)
        {
            {
                panel1.Parent = tabControl1.SelectedTab;

                TabPage selectedTab = tabControl1.SelectedTab;
                int selectedIndex = tabControl1.SelectedIndex;
                tabControl1.SelectedTab = selectedTab;




                // Update the controls in the panel from the
                // data structure to show the correct content        
            }

        }

        //DELETING A WEEK FROM THE TABS
        private void btnDeleteWeek_Click(object sender, EventArgs e)
        {
            // Removes the currently active TabPage. 
            tabControl1.TabPages.Remove(tabControl1.SelectedTab);
            // Disable button if only one TabPage left. Otherwise crash!
            if (tabControl1.SelectedIndex < 1) btnDeleteWeek.Enabled = false;
            // Over to you: delete the data in your data structure


        }

        //CHANGING THE INSTOCK VALUE IN THE COUNTER
        private void numericUpDown2_ValueChanged(object sender, EventArgs e)
        {
            // 1. create a new structure that can hold results for 5 weeks
            myStruct aNewStruct = new myStruct(5);
            // 2. copy the content of the current ArrayList data structure    // into the new structure
            aNewStruct = (myStruct)dataList[currentEntryShown];
            try { aNewStruct.instock[0] = Convert.ToInt32(numericUpDown2.Value); }
            catch { aNewStruct.instock[0] = 0; }
            // 3. update the data structure to what the GUI shows
            aNewStruct.instock[tabControl1.SelectedIndex] = (int)numericUpDown2.Value;
            // 4. overwrite the old data with the changed one.
            dataList[currentEntryShown] = aNewStruct;

        }

        

        private void numericUpDown1_ValueChanged(object sender, EventArgs e)
        {
            // 1. create a new structure that can hold results for 5 matches
            myStruct aNewStruct = new myStruct(5);
            // 2. copy the content of the current ArrayList data structure    // into the new structure
            aNewStruct = (myStruct)dataList[currentEntryShown];
            try { aNewStruct.sold[0] = Convert.ToInt32(numericUpDown1.Value); }
            catch { aNewStruct.sold[0] = 0; }
            // 3. update the data structure to what the GUI shows
            aNewStruct.sold[tabControl1.SelectedIndex] = (int)numericUpDown1.Value;
            // 4. overwrite the old data with the changed one.
            dataList[currentEntryShown] = aNewStruct;

        }
Thanks