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If you're using C#, be sure you put the code after the opening curly brace and just after the class declaration (`public partial class Form1 : Form`). If you're using Visual Basic, put the code right after the class declaration (`Public Class Form1`).
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You can use list objects to keep track of different types of items.
Copy file name to clipboardExpand all lines: docs/get-started/csharp/tutorial-windows-forms-math-quiz-add-math-problems.md
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@@ -5,7 +5,7 @@ ms.custom: vs-acquisition
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dev_langs:
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- "CSharp"
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- "VB"
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ms.date: 03/15/2023
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ms.date: 10/18/2024
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ms.topic: tutorial
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author: anandmeg
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ms.author: meghaanand
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1. On the menu bar, select **View** > **Code**. *Form1.cs* or *Form1.vb* appears, depending on the programming language that you're using, so that you can view the code behind the form.
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1. Create a <xref:System.Random> object by adding a `new` statement near the top of the code.
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1. Create a <xref:System.Random> object by adding a `new` statement near the top of the code in *Form1.cs* or *Form1.vb*.
You can use `new` statements like this one to create buttons, labels, panels, OpenFileDialogs, ColorDialogs, SoundPlayers, Randoms, and even forms. These items are called *objects*.
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When you run your program, the form is started. The code behind it creates a Random object and names it **randomizer**.
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Your quiz needs variables to store the random numbers that it creates for each problem. Before using variables, you declare them, which means listing their names and data types.
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1. Add two integer variables to the form, and name them **addend1** and **addend2**.
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1. Add two integer variables to the form, and name them **addend1** and **addend2** in *Form1.cs* or *Form1.vb*.
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> [!NOTE]
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> An integer variable is known as an *int* in C# or an *Integer* in Visual Basic. This kind of variable stores a positive or negative number from -2147483648 through 2147483647 and can store only whole numbers, not decimals.
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1. Add a method that's named `StartTheQuiz()`. This method uses the Random object's <xref:System.Random.Next> method to generate random numbers for the labels. `StartTheQuiz()` will eventually fill in all the problems and then start the timer, so add this information to the summary comment. The function should look like the following code.
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1. Add a method that's named `StartTheQuiz()`*Form1.cs* or *Form1.vb*. This method uses the Random object's <xref:System.Random.Next> method to generate random numbers for the labels. `StartTheQuiz()` will eventually fill in all the problems and then start the timer, so add this information to the summary comment. The function should look like the following code.
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The next step is to declare variables and provide random values for the other math problems.
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1. Add integer variables for the remaining math problems to your form, after the addition problem variables. The code should look like the following sample.
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1. Add integer variables for the remaining math problems to your form, after the addition problem variables. The code in *Form1.cs* or *Form1.vb*should look like the following sample.
1. Modify the `StartTheQuiz()` method by adding the following code, starting with the "Fill in the subtraction problem" comment.
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1. Modify the `StartTheQuiz()` method in *Form1.cs* or *Form1.vb*by adding the following code, starting with the "Fill in the subtraction problem" comment.
2. In **Windows Forms Designer**, move a <xref:System.Windows.Forms.Timer> control from the **Components** category of the **Toolbox** to your form. The control appears in the gray area at the bottom of the design window.
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3. On the form, select the **timer1** icon that you just added, and set its **Interval** property to **1000**. Because this interval is in milliseconds, a value of 1000 causes the timer to raise a <xref:System.Windows.Forms.Timer.Tick> event every second.
- The first line declares the method. It includes a parameter that's named `sender`. In C#, the parameter is `object sender`. In Visual Basic, it's `sender As System.Object`. This parameter refers to the object whose event is firing, which is known as the sender. In this case, the sender object is the NumericUpDown control.
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