In VB language
Provide a web page with a simple calculator. The web page will have two text boxes (with labels) for data entry, radio list box to select the operation (+, -, *, and /), label to display the result, a calculate button and clear button. Use Validation controls to validate the data entry. Write the code using try/catch block to catch any data entry error. If there is any data entry error then display the message in the result label. Set the default focus of the form to the first text box and default button to calculate button.