Introduction

1. Create a Window Forms Application named ElementaryAddition2
2. Design the form as follows:
    

   Control Text Name TextAlign Font Additional Properties Label 00 lblOperand1 Center Name: Tahoma Size:   48 Bold:   True AutoSize: True ForeColor: Blue Label +   Center Name: Arial Size:   50 Bold:   True AutoSize: True ForeColor: Maroon Label 00 lblOperand2 Center Name: Tahoma Size:   48 Bold:   True AutoSize: True ForeColor: Blue Label =   Center Name: Arial Size:   50 Bold:   True AutoSize: True ForeColor: Green TextBox 000 txtResult Center Name: Tahoma Size:   48 Bold:   True   Label New Operation lblNewOperation Center Name: Tahoma, Size: 28 Bold: True AutoSize: True BorderStyle: Fixed3D ForeColor: White BackColor:Maroon  Label Check lblCheckAnswer Center Name: Tahoma, Size: 28 Bold: True AutoSize: True BorderStyle: Fixed3D ForeColor: White BackColor:Maroon  Label Quit lblQuit Center Name: Tahoma, Size: 28 Bold: True AutoSize: True BorderStyle: FixedSingle

3. Double-click the New Operation label and implement its event as follows:
   

   private void lblNewOperation_Click(object sender, EventArgs e)
   {
           int operand1;
           int operand2;
   
           Random rnd = new Random();
   
           operand1 = rnd.Next(99);
           operand2 = rnd.Next(99);
           int result = operand1 + operand2;
   
           lblOperand1.Text = operand1.ToString();
           lblOperand2.Text = operand2.ToString();
           txtResult.Text   = "";
           txtResult.Focus();
   }

4. Return to the form and double-click the Check label
5. Implement its event as follows:
   

   private void lblCheckAnswer_Click(object sender, EventArgs e)
   {
           int Operand1 = 0;
           int Operand2 = 0;
           int Result = 0;
   
           try
           {
                   Operand1 = int.Parse(lblOperand1.Text);
           }
           catch (FormatException)
           {
                   MessageBox.Show("Invalid Value");
           }
   
           try
           {
                   Operand2 = int.Parse(lblOperand2.Text);
           }
           catch (FormatException)
           {
                   MessageBox.Show("Invalid Value");
           }
   
           try
           {
                   Result = int.Parse(txtResult.Text);
           }
           catch (FormatException)
           {
                   MessageBox.Show("Invalid Answer");
           }
   
           if (Result == (Operand1 + Operand2))
                   MessageBox.Show("WOW - Good Answer");
           else
                   MessageBox.Show("PSSST - Wrong Answer");
   
           lblNewOperation_Click(sender, e);
   }

6. Return to the form and double-click Quit
7. Implement its event as follows:
   

   private void lblQuit_Click(object sender, EventArgs e)
   {
               Close();
   }

8. Execute the application and test it
9. Click the Close button to close the form and return to your programming environment