How to update entity framework row in listbox

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Hello Guys am working on a project an i am facing a problem if i am adding a item in listbox so items add successfully and now i want if i add same items two times so its not add 2 times it's add 1 times but it's show quantity with mulitplication amount.

i am using this code for adding items in listbox

C#

Button b = (Button)sender;
                 tblProduct tp2 = (tblProduct)b.Tag;
                 string product2 = tp2.productName;
                 listBox2.Text = tp2.ToString();
                 products2.Add(tp2);
                 total2 += (decimal)tp2.productPrice;

Please look at this image:
Imgur: The most awesome images on the Internet[^]

What I have tried:

int Qlty = +1;
string ProductName = ((tblProduct)e.ListItem).productName;
string Price = "Rs: " + String.Format("{0:}", ((tblProduct)e.ListItem).productPrice);
string ProductNamePadded = ProductName.PadRight(33);
e.Value = ProductNamePadded+Qlty+Price;

Posted 7-Aug-16 0:30am

Member 9983063

Updated 8-Aug-16 23:48pm

v4

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Comments

Richard MacCutchan 7-Aug-16 8:09am

You need to check if the item is already in the ListBox.

Member 9983063 7-Aug-16 10:09am

exactly i need this.But i dont know how to do this please help me about this

Member 9983063 7-Aug-16 12:38pm

sir i found the solution of how to check if the item is already in the listbox
here is the solution
var duplicates = products.GroupBy(i => i.productName)
.Where(x => x.Count() > 1)
.Select(val => val.Key);

foreach (var item in duplicates)
{
//now please tell me which code i write here that solve issue
}

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njammy · Answer 1 · 2016-08-08T23:48:00

I would design the objects as follows. This solution can be copied to a console app to test it.
See it working here[^]

Notice I've added a stub method for you to check if an item is already added, although the following logic should help you avoid having to check manually and tediously if something is already in a list.

C#

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

public class Program
{
	public void Main()
	{
		// Simulate order
		Order order = new Order
		{
			TableNumber = "Table 1",
			Products = new List<Product>
			{
				new Product { Name = "Item 1", Price = 100.00m, Quantity = 3},
				new Product { Name = "Item 2", Price = 89.00m, Quantity = 2},
				new Product { Name = "Item 3", Price = 50.00m, Quantity = 1 }
			}
		};
		
		
		foreach(var p in order.Products)
		{
			Console.WriteLine(p.Name + " (Each: " + p.Price + ")" + " - Qty: " + p.Quantity + " (" + p.Total() + ")");
		}
	}
}

public class Order
{
	public List<Product> Products { get; set; }

	public string TableNumber{get;set;}
	
	public decimal Total()
	{
		if (Products.Any())
			return Products.Sum(x => x.Price);
		return 0.00m;
	}

	public Order()
	{
		Products = new List<Product>();
	}
	
	public void RemoveProduct()
	{
		// Implement here remove logic
	}
	
	public bool IsAdded(string productName)
	{
		return Products.Any(x=>x.Name.ToLower() == productName.ToLower());
	}
}

public class Product
{
	public string Name { get; set; }
	public decimal Price { get; set; }
	public int Quantity { get; set; }
	
	public decimal Total()
	{
		return Price * Quantity;
	}
}