void _equalsButton_Click(object sender, RoutedEventArgs e)
{
double operand1 = double.Parse(_operand1.Text);
double operand2 = double.Parse(_operand2.Text);
string opcode = ((TextBlock)_op.SelectedValue).Text;
// Start the call to the web service asynchronously, calling CalcComplete
// when each calculation is complete and passing the calc opcode via
// IAsyncResult.AsyncState so we can know which proxy End method to call
switch (opcode)
{
case "+":
client.BeginAdd(operand1, operand2, CalcComplete, opcode);
break;
case "-":
client.BeginSubtract(operand1, operand2, CalcComplete, opcode);
break;
case "*":
client.BeginMultiply(operand1, operand2, CalcComplete, opcode);
break;
case "/":
client.BeginDivide(operand1, operand2, CalcComplete, opcode);
break;
}
// Let the user know
_numberTextBlock.Text = "(getting result)";
}
