Re: read value from item array in user control - C# Discussion Boards

Gerry Schmitz25-Jul-14 11:19

25-Jul-14 11:19

Add a list to your form (e.g. List<ctlpassengers>) to which you add your user controls as you create them. This avoids having to traverse the visual tree later to get at them.

Once you're ready to read back the name values, iterate over the controls in the previously created list.

Jassim Rahma25-Jul-14 12:42

Jassim Rahma

25-Jul-14 12:42

sorry I didn't get you...

Technology News @ www.JassimRahma.com

Gerry Schmitz25-Jul-14 14:09

25-Jul-14 14:09

txtFirstName and txtLastName are "text boxes" in your "user control"; right?

To access the text box contents (.Text) you need a reference to the users controls and the text boxes; no?

Aren't you creating these "user controls" on the fly and adding them to your (devExpress) form?

If not, what was the purpose of the code you posted?

Jassim Rahma25-Jul-14 14:34

Jassim Rahma

25-Jul-14 14:34

You are right in all but in this case I am creating multiple controls from the same user control. The user control has just one txtFirstName but when users sets total_adults=5 in Form1 then five txtFirstName controls will be created on the Form2

Thats why I am asking how can I change the property class to return the value and from Form2 I need when clicking Save to save read the value of all fives txtFirstName controls.

Thanks
Jassim

Technology News @ www.JassimRahma.com

Gerry Schmitz25-Jul-14 15:01

25-Jul-14 15:01

Add a list to your form:

list<uc> mylist = new list<uc>.

As you create and add uc's to the form, add them to the list also:

mylist.add(myuc)

When you click "save", iterate the list to access controls and their contents:

foreach ( uc myuc in mylist){

.... myuc.txtFirstName.Text ...
etc.
}

One set of controls; multiple "references" to those controls: form; list.

KUMAR61927-Jul-14 20:54

KUMAR619

27-Jul-14 20:54

I think you have to create a method form doing this.

If you have limit for total adults its easy else you have go for Max value.

If you say 10 is the maximum adult capacity.

List<string> lstFirstName=new List<string>();
List<string> lstSecondName=new List<string>();

void RetrieveValues()
{
if(adultCount>0)
{
for(int i=1;i<=adultCount;i++)
{
string first=txtFirstName.Name+i.ToString();
string second=txtSecondName.Name+i.ToString();
lstFirstName.Add((TextBox)first.Text);
lstFirstName.Add((TextBox)second.Text);
}

}
}

This may work. If its not working please reply with the error you are facing.

User 873938131-Jul-14 0:02

User 8739381

31-Jul-14 0:02

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        List<myControls> lst;


        private void button1_Click(object sender, EventArgs e)
        {
            int max = int.Parse(txtInput.Text);
            lst = new List<myControls>();
            for (int i = 0; i < max; i++)
            {
                new myControls();
                lst.Add(new myControls());
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            foreach (var item in lst)
            {
                MessageBox.Show(item.Name);
            }
        }
    }
    class myControls
    {
        public string Name;
        public TextBox t;
        public Label l;

    }

//by default control's modifiers property is set to private. Make it public to access from other classes.

modified 3-Sep-19 21:02pm.

Comparison Overloading

Rig Maitra25-Jul-14 6:14

Rig Maitra

25-Jul-14 6:14

Hi, I have made a program to compare the pages of 2 books using the overloading concept. But i m not sure that is correct or not. Please see my code and tell me whether my program is logically correct or not based on the concept..

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

namespace comp
{
class book1
{

public int page1;

}
class book2:book1
{

public int page2;

public book2(int p1 ,int p2)
{

page1 = p1;
page2 = p2;
}

public static bool operator <(book2 b1, book2 b2) // overloading
{
if (b1.page1 < b2.page2)
return (true);
else
return (false);
}

public static bool operator >(book2 b1, book2 b2)
{
if (b1.page1 > b2.page2)
return (true);

else
return (false);
}

}

class Program
{
static void Main(string[] args)
{

book2 b2 = new book2(5,10); // passing parameters

if (b1.page1 < b2.page2)

{
Console.WriteLine("book 1 has less pages than book 2");
}

else if (b1.page1 > b2.page2)
{
Console.WriteLine("book1 has more pages than book 2");
}

Console.ReadLine();

}
}
}

Rob Philpott25-Jul-14 6:23

Rob Philpott

25-Jul-14 6:23

Whoa, there's quite a lot which is not right there.

By the look you have overloaded operators to compare books, but you are actually comparing pages!

Regards,
Rob Philpott.

Rig Maitra25-Jul-14 6:29

Rig Maitra

25-Jul-14 6:29

Hey rob, i thought better to compare the no. of pages of the books .. But if i compile this it wont print the message.( I m new to this overloading concept). What do you suggest how it should be then ??

Rob Philpott25-Jul-14 6:43

Rob Philpott

25-Jul-14 6:43

OK. Why do you have two book classes, one derived from the other?

In OOD, when you derive something it specializes the thing it derives from. In this case, it adds a second integer member called Page2. What's going on here?

If you can, avoid this as this is just a distraction from what you're trying to do - operator overloading.

Regards,
Rob Philpott.

OriginalGriff25-Jul-14 8:50

OriginalGriff

25-Jul-14 8:50

As Rob has said, deriving from a base class specialises something - a book does not derive from a previous book except when it is an expanded version: the Directors Cut if you like.

Think about it: a "Book by Charlotte Bronte" derives from "Book", and so does a "Book by Terry Pratchett" - but that is pretty much the only thing they have in common: the elements which are common to all books (Pages, a cover, a title, an author) and so forth.

You wouldn't overload a method to get a number of pages from two different books, because the number of pages is a property of the individual instance on the book. But... you might overload it to get different information which is also instance specific:

public class Book
    {
    private int pages;
    private List<int> chapters = new List<int>();
    public int GetPages()
        {
        return pages;
        }
    public int GetPages(int chapter)
        {
        int lastPage = pages;
        if (chapter >= chapters.Count || chapter < 0) return 0;
        if (chapter != chapters.Count - 1) lastPage = chapters[chapter + 1];
        return lastPage - chapters[chapter];
        }
    }

This has two overloaded GetPages methods.
If you don't supply any parameters it returns the number of pages in the book.
If you pass it an integer, it returns the pages in that chapter.

The type of the parameter determines which version of the method gets called, and thus what the method does.

Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952)
Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)

C# how to compare the old product(serialized) to new product,If same product means add the quantity only not repeated that product in output for below program

KUMAR61928-Jul-14 17:53

KUMAR619

28-Jul-14 17:53

You are right but you need make some modifications to simplify it.

Member 1097120125-Jul-14 3:22

Member 10971201

25-Jul-14 3:22

//PRODUCT CODE

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

namespace ConsoleApplication4
{
[Serializable]
public class Product
{
private string ProductID;
private string ProductName;
private float Price;
private int Quantity;

public Product()
{
}

public void Read()
{
Console.WriteLine("Enter Product ID : ");
ProductID = Console.ReadLine();
Console.WriteLine("Enter Product Name : ");
ProductName = Console.ReadLine();
Console.WriteLine("Enter Price : ");
Price = float.Parse(Console.ReadLine());
Console.WriteLine("Enter Quantity : ");
Quantity = int.Parse(Console.ReadLine());
}

public void Show()
{
Console.WriteLine("{0}\t\t{1}\t\t{2}\t\t{3}", ProductID, ProductName, Price, Quantity);
}
}
}

//MAIN PROGRAM CODE

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;

namespace ConsoleApplication4
{
class Program
{
static void Main(string[] args)
{
List list = new List();
int op;
try
{
Stream stream = File.Open("F:\\Product.obs", FileMode.Open);
BinaryFormatter formatter = new BinaryFormatter();
list = (List)formatter.Deserialize(stream);
}
catch (Exception ex)
{
}
do
{
Console.Clear();
Console.WriteLine("1.New product");
Console.WriteLine("2.List All");
Console.WriteLine("0.Exit");
Console.WriteLine("------------------");
Console.WriteLine("Enter Choice : ");
op = int.Parse(Console.ReadLine());
switch (op)
{
case 1:
Product p = new Product();
p.Read();
list.Add(p);
break;
case 2:
Console.WriteLine("Product Details");
Console.WriteLine("--------------------");
Console.WriteLine("ProductID\t ProductName\t Price\t Quantity");
Console.WriteLine("------------------------------------------");
for (int i = 0; i < list.Count; i++)
{
p = list[i];

p.Show();
}
break;
case 0:
Stream stream = File.Open("F:\\Product.obs", FileMode.Create);
BinaryFormatter formatter = new BinaryFormatter();
formatter.Serialize(stream, list);
break;
}
Console.ReadKey();
}
while (op != 0);
}
}
}

Re: C# how to compare the old product...

OriginalGriff25-Jul-14 4:35

OriginalGriff

25-Jul-14 4:35

First, I'm not reading it like that - use the code block (<pre> tags) to preserve the formatting so the code is readable.

Then, explain you problem in reasonable detail in the question, instead of in the title - remembering that we can't see your screen, access your HDD, or read your mind.

Explain what you are having problems with - what the code does and doesn't do, and why. At the moment, you've just dumped some code on us and said "fix this".
Help us to help you!

Entity Framework

Steve Foutty25-Jul-14 3:14

Steve Foutty

25-Jul-14 3:14

I inherited an app that was created using EF6 - Model First. How do I update the database after making modifications to the tables? If it was code first I could use migrations to handle it, but I'm hesitant to try that with this model.

Re: Entity Framework

Gerry Schmitz25-Jul-14 11:30

25-Jul-14 11:30

I think you need to clarify your terminology.

The "tables" ARE the "database".

Did you modify the "database" and now want to update the "model"? In which case, you open the ".edmx", right-click the design surface, and then click "Update model from database...".

... Backing up your project first, of course.

modified 25-Jul-14 19:49pm.

Re: Entity Framework

Steve Foutty25-Jul-14 13:46

Steve Foutty

25-Jul-14 13:46

Doesn't that drop all the tables and their data?

Re: Entity Framework

Gerry Schmitz25-Jul-14 14:03