Using Radio Buttons

This exercise combines labels, panels, radio buttons, and text boxes to create an application. It illustrates how to use radio buttons as regular buttons: Prerequisites: Radio Buttons Text Boxes Panel Labels Buttons

1. Start Microsoft Visual C# and create a Windows Application named Calculation
2. Design the form as follows:
    

   Control Name Text Other Properties Panel       Label   Number &1:   TextBox txtNumber1   Text: 0.00 TextAlign: Right Label   Number &2:   TextBox txtNumber2   Text: 0.00 TextAlign: Right Label   Result:   TextBox txtResult 0.00 Text: 0.00 TextAlign: Right Panel       RadioButton rdoAddition &Addition CheckAlign: MiddleRight RadioButton rdoSubtraction &Subtraction CheckAlign: MiddleRight RadioButton rdoMultiplication &Multiplication CheckAlign: MiddleRight RadioButton rdoDivision &Division CheckAlign: MiddleRight Button btnClose Close

3. Double-click the Close button and double-click each radio button
4. Implement their Click events as follows:
    

   private void btnClose_Click(object sender, System.EventArgs e) { Close(); } private void rdoAddition_CheckedChanged(object sender, System.EventArgs e) { double Number1, Number2, Result; try { Number1 = Convert.ToDouble(txtNumber1.Text); Number2 = Convert.ToDouble(txtNumber2.Text); Result = Number1 + Number2; txtResult.Text = Result.ToString(); } catch(System.FormatException fmtE) { MessageBox.Show(fmtE.Message); } } private void rdoSubtraction_CheckedChanged(object sender, System.EventArgs e) { double Number1, Number2, Result; try { Number1 = Convert.ToDouble(txtNumber1.Text); Number2 = Convert.ToDouble(txtNumber2.Text); Result = Number1 - Number2; txtResult.Text = Result.ToString(); } catch(System.FormatException fmtE) { MessageBox.Show(fmtE.Message); } } private void rdoMultiplication_CheckedChanged(object sender, System.EventArgs e) { double Number1, Number2, Result; try { Number1 = Convert.ToDouble(txtNumber1.Text); Number2 = Convert.ToDouble(txtNumber2.Text); Result = Number1 * Number2; txtResult.Text = Result.ToString(); } catch(System.FormatException fmtE) { MessageBox.Show(fmtE.Message); } } private void rdoDivision_CheckedChanged(object sender, System.EventArgs e) { double Number1, Number2, Result; try { Number1 = Convert.ToDouble(txtNumber1.Text); Number2 = Convert.ToDouble(txtNumber2.Text); Result = Number1 / Number2; txtResult.Text = Result.ToString(); } catch(System.FormatException fmtE) { MessageBox.Show(fmtE.Message); } } }

5. Test the application.