CODE

---

namespace Definitions
{
    public partial class Form46 : Form
    {
        public Form46()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            MessageBox.Show("Hello World.");
        }

    }
}
                    

OUTPUT

---

Form46

×

×

Hello World.

CODE

---

namespace Definitions
{
    public partial class Form47 : Form
    {
        public Form47()
        {
            InitializeComponent();
        }

        private void btnDisplay_Click(object sender, EventArgs e)
        {
            label1.Text = textBox1.Text;
        }

    }
}
                    

OUTPUT

---

Form47

×

Hello C#!

Hello C#!

CODE

---

namespace Definitions
{
    public partial class Form48 : Form
    {
        public Form48()
        {
            InitializeComponent();
        }

        private void btnAdd_Click(object sender, EventArgs e)
        {
            try 
            {
                double num1 = Convert.ToDouble(txtNum1.Text);
                double num2 = Convert.ToDouble(txtNum2.Text);
                lblResult.Text = "Result: " + (num1 + num2).ToString();
            }
            catch (Exception)
            {
                lblResult.Text = "Invalid Input";
            }
        }
        
        // Similar click events would be added for Subtract, Multiply, and Divide buttons
    }
}
                    

OUTPUT

---

Calculator

×

25

5

Result: 30

CODE

---

namespace Definitions
{
    public partial class Form49 : Form
    {
        public Form49()
        {
            InitializeComponent();
        }

        private void btnChangeColor_Click(object sender, EventArgs e)
        {
            // Changes the background color of the current form instance
            this.BackColor = Color.LightBlue;
        }

    }
}
                    

OUTPUT

---

Form49

×

CODE

---

namespace Definitions
{
    public partial class Form50 : Form
    {
        public Form50()
        {
            InitializeComponent();
        }

        private void Form50_Load(object sender, EventArgs e)
        {
            // Adding array of countries to ComboBox on form load
            string[] countries = { "India", "USA", "Canada", "Australia", "Japan" };
            comboBox1.Items.AddRange(countries);
            
            // Set default selected index
            comboBox1.SelectedIndex = 0; 
        }

    }
}
                    

OUTPUT

---

Select Country Form

×

Select a Country:

India ▼

C# | SU [ 46 - 50 ] [ FOR JOURNAL ]

CODE

---

namespace Definitions
{
    public partial class Form46 : Form
    {
        public Form46()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            MessageBox.Show("Hello World.");
        }

    }
}
                    

OUTPUT

---

Form46

×

×

Hello World.

CODE

---

namespace Definitions
{
    public partial class Form47 : Form
    {
        public Form47()
        {
            InitializeComponent();
        }

        private void btnDisplay_Click(object sender, EventArgs e)
        {
            label1.Text = textBox1.Text;
        }

    }
}
                    

OUTPUT

---

Form47

×

Hello C#!

Hello C#!

CODE

---

namespace Definitions
{
    public partial class Form48 : Form
    {
        public Form48()
        {
            InitializeComponent();
        }

        private void btnAdd_Click(object sender, EventArgs e)
        {
            try 
            {
                double num1 = Convert.ToDouble(txtNum1.Text);
                double num2 = Convert.ToDouble(txtNum2.Text);
                lblResult.Text = "Result: " + (num1 + num2).ToString();
            }
            catch (Exception)
            {
                lblResult.Text = "Invalid Input";
            }
        }
        
        // Similar click events would be added for Subtract, Multiply, and Divide buttons
    }
}
                    

OUTPUT

---

Calculator

×

25

5

Result: 30

CODE

---

namespace Definitions
{
    public partial class Form49 : Form
    {
        public Form49()
        {
            InitializeComponent();
        }

        private void btnChangeColor_Click(object sender, EventArgs e)
        {
            // Changes the background color of the current form instance
            this.BackColor = Color.LightBlue;
        }

    }
}
                    

OUTPUT

---

Form49

×

CODE

---

namespace Definitions
{
    public partial class Form50 : Form
    {
        public Form50()
        {
            InitializeComponent();
        }

        private void Form50_Load(object sender, EventArgs e)
        {
            // Adding array of countries to ComboBox on form load
            string[] countries = { "India", "USA", "Canada", "Australia", "Japan" };
            comboBox1.Items.AddRange(countries);
            
            // Set default selected index
            comboBox1.SelectedIndex = 0; 
        }

    }
}
                    

OUTPUT

---

Select Country Form

×

Select a Country:

India ▼