🎯 Update UI with SetValue 🖼️✨

👋 Hello, future coding masters! Today, we’re going to solve a tricky problem that many programmers face: Why does the screen not update when I change something? 🤔

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🧐 The Mystery – Why Doesn’t It Work?

Imagine you have a list of objects displayed on the screen 📋, like a list of students in a classroom. Each student has a name and a photo.

Now, you try to change one student’s photo 📷, but nothing happens on the screen!

Why? Let’s investigate! 🕵️‍♂️🔍

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💡 The First Way – The One That Doesn’t Work 🚫

What happens here?

1️⃣ You go outside the classroom and find another student with the same name.
2️⃣ You give that student a new photo 🖼️.
3️⃣ But the student inside the classroom is still the same! They never got the new photo!

🔴 This means the screen doesn’t change!

Code Example (The One That Fails)

// 🔍 Get a new student object from outside (from the database or file)
var studentList = await LoadStudentsAsync(s => s.Name == "Alice"); 

// 🚨 This gets a new copy, NOT the one in the classroom!
var studentOutside = studentList.ToList()[0]; 

// ✏️ Try to change the photo
var property = studentOutside.GetType().GetProperty("Photo");
if (property != null)
{
    property.SetValue(studentOutside, newPhoto);
}

// ❌ The screen does NOT update because studentOutside is NOT the one inside the classroom!

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✅ The Second Way – The One That Works! 🎉

What happens here?

1️⃣ You walk directly to the student inside the classroom 🏫.
2️⃣ You give them the new photo. 📷
3️⃣ The screen immediately updates because you changed the student inside the classroom!

🔵 Now, the change is visible! 🎊

Code Example (The Correct Way)

// 🔍 Find the student who is ALREADY inside the classroom (DataGrid)
var studentInside = ClassDataGrid.ItemsSource
    .Cast<StudentModel>()
    .FirstOrDefault(s => s.Name == "Alice");

if (studentInside != null)
{
    // ✏️ Change the photo of the student INSIDE the classroom
    var property = studentInside.GetType().GetProperty("Photo");
    property?.SetValue(studentInside, newPhoto);

    // ✅ Now the screen updates immediately!
}

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🎯 What Did We Learn?

✅ If you want the screen to update, change the thing that is already inside.
✅ If you create a new one outside, it won’t be connected to the screen.
✅ Always update what’s inside, not a copy of it!

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🚀 Pro Tips for Future Masters

💡 Think of it like a notebook 📖 – if you write something on a new page, but the teacher is looking at the old one, they won’t see your changes! Change the page the teacher is looking at! 🎯