In this we will create simple calculator that
is able to add, subtract, multiply, and divide values.
Add following controls to your page, set their ID and other properties as in the
following table and arrange the control as shown in figure 1.2
Table
![tableControl.png]()
figure 1.2
![calcpage.png]()
Double click the Calculate button and add the following code to click event of
button.
protected
void Button1_Click(object
sender, EventArgs e)
{
if (TextBox1.Text.Length > 0 &&
TextBox2.Text.Length > 0)
{
double res = 0;
double value1 =
Convert.ToDouble(TextBox1.Text);
double value2 =
Convert.ToDouble(TextBox2.Text);
switch (OperatorList.SelectedValue)
{
case "+":
res =
value1 + value2;
break;
case "-":
res =
value1 - value2;
break;
case "*":
res =
value1 * value2;
break;
case "/":
res =
value1 / value2;
break;
}
LblResult.Text =
res.ToString();
}
else
LblResult.Text =
string.Empty;
}
Save all the changes and press ctrl+F5 to open the web page in browser.
Go ahead and enter the number in first and second textbox.
Choose the operator from drop-down list, and click calculate button. you
will see lable is updated with result