[Dan_man]

I have a question about how to populate comboboxes within one form from values from another form. In my case I have an "addOrderForm" with comboboxes(customers and products) that should be populated with all the customers and products from the parent forms data manager. I understand what i need to do, but I can't quiet get there C# is not very forgiving with regards of guessing where to put a piece of code. I've been researching some methods and I understand items.add would be a good place to start. Sorry about the thinking aloud. Thanks for anyones help!

Spoiler

DataManager

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;

namespace SalesManager
{
    public class DataManager
    {
        private ArrayList customerList = new ArrayList();

        public void addCustomer(Customer c)
        {
            customerList.Add(c);
        }

        public void removeCustomer(Customer c)
        {
            customerList.Remove(c);
        }

        public Customer[] getAllCustomers()
        {
            return (Customer[])customerList.ToArray(typeof(Customer));
        }

        public Customer getCustomerAtIndex(int index)
        {
            return (Customer)customerList[index];
        }
        private ArrayList productList = new ArrayList();

        public void addProduct(Product d)
        {
            productList.Add(d);
        }

        public void removeProduct(Product d)
        {
            productList.Remove(d);
        }

        public Product[] getAllProducts()
        {
            return (Product[])productList.ToArray(typeof(Product));
        }

        public Product getProductAtIndex(int index)
        {
            return (Product)productList[index];
        }
        
        private ArrayList orderList = new ArrayList();

        public void addOrder(Order e)
        {
            orderList.Add(e);
            
        }
        public void removeOrder(Order e)
        {
            orderList.Remove(e);
            
        }
        public Order[] getAllOrders()
        {
            return (Order[])orderList.ToArray(typeof(Order)); 
           
        }

        public Order getOrderAtIndex(int index)
        {
            return (Order)orderList[index];
            
        }
    }

}

SalesManager

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace SalesManager
{
    public partial class SalesManager : Form
    {
        public DataManager data = new DataManager();


        public SalesManager()
        {
            InitializeComponent();
        }

        private void addCustomerButton_Click(object sender, EventArgs e)
        {
            AddCustomerForm myNewForm = new AddCustomerForm(this);
            myNewForm.Show();
            //"this" represents the current running instance of the class
        }

        public void loadCustomers()
        {
            //clear the panel
            customerPanel.Controls.Clear();
            //get the customers
            Customer[] custList = data.getAllCustomers();
            //for each customer
            for (int i = 0; i < custList.Length; i++)
            {
                //make a checkbox and set some properties
                CheckBox tmp = new CheckBox();
                string tmpName = custList[i].getName();
                string tmpPhone = custList[i].getPhone();
                tmp.Text = "Name: " + tmpName + " Phone: " + tmpPhone;
                tmp.AutoSize = true;
                tmp.Location = new Point(0, 20 * i);
                tmp.CheckedChanged += new EventHandler(handleCustomerClick);
                //add it to the panel
                customerPanel.Controls.Add(tmp);
            }

        }

        private void handleCustomerClick(object sender, EventArgs e)
        {

            CheckBox source = (CheckBox)sender;
            if (source.Checked == true)
            {
                for (int i = 0; i < customerPanel.Controls.Count; i++)
                {
                    CheckBox target = (CheckBox)customerPanel.Controls[i];
                    if (!source.Equals(target))
                    {
                        target.Checked = false;
                    }
                }
            }



        }

        private void removeCustomerButton_Click(object sender, EventArgs e)
        {
            //look at each checkbox
            for (int i = 0; i < customerPanel.Controls.Count; i++)
            {
                //if there's a check in the box:
                CheckBox candidate = (CheckBox)customerPanel.Controls[i];
                if (candidate.Checked == true)
                {
                    //then ask the data manager which customer lives there
                    Customer toBeDeleted = data.getCustomerAtIndex(i);
                    //and tell the data manager to delete that customer
                    data.removeCustomer(toBeDeleted);
                }
            }
            //reload the customers in the panel
            loadCustomers();
        }

        private void tabPage2_Click(object sender, EventArgs e)
        {

        }

        private void addProductButton_Click(object sender, EventArgs e)
        {
            AddProductForm myNewForm = new AddProductForm(this);
            myNewForm.Show();
        }
        public void loadProducts()
        {
            productPanel.Controls.Clear();
            Product[] prodList = data.getAllProducts();
            for (int p = 0; p < prodList.Length; p++)
            {
                CheckBox pmp = new CheckBox();
                string pmpName = prodList[p].getName();
                pmp.Text = "Name: " + pmpName;
                pmp.AutoSize = true;
                pmp.Location = new Point(0, 20 * p);
                pmp.CheckedChanged += new EventHandler(handleProductClick);
                productPanel.Controls.Add(pmp);

            }
        }
        private void handleProductClick(object sender, EventArgs e)
        {
            CheckBox source = (CheckBox)sender;
            if (source.Checked == true)
            {
                for (int p = 0; p < customerPanel.Controls.Count; p++)
                {
                    CheckBox target2 = (CheckBox)productPanel.Controls[p];
                    if (!source.Equals(target2))
                    {
                        target2.Checked = false;
                    }
                }
            }
        }
        
                private void removeProductButton_Click_1(object sender, EventArgs e)
                {
                    //look at each checkbox
                    for (int p = 0; p < productPanel.Controls.Count; p++)
                    {
                        //if there's a check in the box:
                        CheckBox candidate = (CheckBox)productPanel.Controls[p];
                        if (candidate.Checked == true)
                        {
                            //then ask the data manager which customer lives there
                            Product toBeDeleted = data.getProductAtIndex(p);
                            //and tell the data manager to delete that customer
                            data.removeProduct(toBeDeleted);
                        }
                    }
                    //reload the customers in the panel
                    loadProducts();
                }

                private void addOrderButton_Click(object sender, EventArgs e)
                {
                    AddOrderForm myNewForm = new AddOrderForm(this);
                    myNewForm.Show();
                    //"this" represents the current running instance of the class
                }

                 
      

            }
        }

AddProductForm

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace SalesManager
{
    public partial class AddProductForm : Form
    {
        private SalesManager parent;

        public AddProductForm(SalesManager p)
        {
            InitializeComponent();
            parent = p; 
        }

        private void cancelButton_Click(object sender, EventArgs e)
        {
            this.Dispose();
        }

        private void createCustomerButton_Click(object sender, EventArgs e)
        {
            
            string newProdName = nameBox.Text;
            Product myNewProduct = new Product(newProdName);
            parent.data.addProduct(myNewProduct);
            parent.loadProducts();
            this.Dispose();

        }
    }
}
            
            
            
       

AddOrderForm

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace SalesManager
{
    public partial class AddOrderForm : Form
    {
        private SalesManager parent;
        public AddOrderForm(SalesManager p)
        {
            InitializeComponent();
            parent = p;
        }
        public class combobox : ListControl
        {
            
        }

        private void cancelButton_Click(object sender, EventArgs e)
        {
            this.Dispose();
        }

        private void createOrderButton_Click(object sender, EventArgs e)
        {
            
        }
    }
}

This post has been edited by tlhIn`toq: 17 February 2013 - 07:37 AM
Reason for edit:: fixed last code tag

[Dan_man]

Sorry about the large amount of code. I just copied the AddProductForm and AddOrderForm - no reason I wouldn't be able to understand the same process for AddCustomerForm.

[tlhIn`toq]

[*]Q: ...get Form/class 'A' to make a change or talk to Form/class 'B'

Spoiler

NOTE: Don't try to access GUI controls across forms. Its wrong. Nobody will hire you if you do this sort of crap. It violates every guideline for 'black box' programming, Separation of Responsibility, loose binding of components, and event driven programming. Read the tutorials and learn to do it right the first time so you don't develop bad habits that you just have to un-learn later.
A:

• See this thread for the simplest of example code between two forms.
  
  The tutorials below actually teach and explain it further.
  
• Passing values between forms/classes
  
• Bulding an application - Part 1
  
• Building an application - Part 2
  
• Quick and easy custom events
  
• Delegates, Lambdas and Events
  
• http://www.codeproje...g-Windows-Forms