Populate a class from textbox C#

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Hi everyone . I am trying to fill class with data and use these data anywhere else on the program, where i Will need it.

I created this class

C#

public class id
{

private string name; // field

public string Name // property
{
get { return name; } // get method
set { name = value; } // set method
}
}

And in form_name i tried to fill the class on this way:

C#

private void Button_Click(object sender, RoutedEventArgs e)
{
id IDOBJE = new id();
{
IDOBJE.Name = txtshenimi.Text;
}
this.Close();
}
}

But i don;t get any result. Could someone help me to clarify this, cause i am new to OOP, and don;t know so much about classes, and objects.

What I have tried:

And in another form i tried to retrieve data like this:

C#

private void Button_Click_1(object sender, RoutedEventArgs e)
{
id idobje = new id();
txtrez.Text = idobje.Name;
}

Posted 14-Jun-20 0:08am

User 12462702

Updated 14-Jun-20 23:34pm

Maciej Los

v2

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OriginalGriff · Answer 1 · 2020-06-14T00:28:00

The problem is that when you create your id instance in the Click handler, it a local variable that holds it:

C#

private void Button_Click(object sender, RoutedEventArgs e)
   {
   id IDOBJE = new id();
   ...
   }

So at the end of the method, it's thrown away - as are all local variables.
Worse, you then close the form!

Instead of trying to create a new instance, use the current one, and create a property in your form which allows the outside world to access it.

C#

        public class id
            {
            public string Name { get; set; }
            }
...
        public id Id { get; private set; } = new id();
        private void Button_Click(object sender, EventArgs e)
            {
            Id.Name = txtshenimi.Text;
            this.Close();
            }

Then when your form closes, the calling code - assuming it used ShowDialog to display the form - can access the id as necessary.

Maciej Los · Answer 2 · 2020-06-14T23:35:00

Take a look at your code:

C#

//form 1
private void Button_Click(object sender, RoutedEventArgs e)
{
id IDOBJE = new id();
...//skiped lines
}

//form 2
private void Button_Click(object sender, RoutedEventArgs e)
{
id IDOBJE = new id();
...//skiped lines
}

Every time you're creating new instance of id class - level of scope: method.

I'd suggest to read about: Scope of Variables in C# - GeeksforGeeks[^]

If you would like to create single instance of id class and use it in each window of your application, you have to declare a variable in Program class or in your custom static class (you have to add it before):

C#

static class MyHelper
{
    public static id SingleId;
}

Finally:

C#

//write 
MyHelper.SingleId = new id();
MyHelper.SingleId.Name = txtshenimi.Text;

//read
id sid = MyHelper.SingeId;
txtshenimi.Text = sid.Name;

For further details, please see: Access Modifiers - C# Programming Guide | Microsoft Docs[^]

I'd suggest to start with basics: C# Tutorials | Microsoft Docs[^]

Seems, you've created WPF application (i see RoutedEventArgs in click event). Note, that WPF is not the same as WinForm! See: WPF vs. WinForms - The complete WPF tutorial[^] Do not mix them!

Populate a class from textbox C#

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