This is a very simple code just like a calculator. The purpose of this code is to teach you how to calculate two number using TextBoxes a ComboBox and a Button. I am using the switch statement and a solution to common problems on how to display integer value to a TextBox.

I decided to upload this because I found some question on the internet regarding on how to convert string to integer as well as how to convert integer to string.

The program contains a very simple code as shown below:

private void btnCalculate_Click(object sender, EventArgs e)
{
int firstno = int.Parse(txtFirstNo.Text);
int secondno = int.Parse(txtSecondNo.Text);
int intTotal;

intTotal = 0;

switch (cboOperator.Text)
{
case "+":
intTotal = firstno + secondno;
break;
case "-":
intTotal = firstno - secondno;
break;
case "*":
intTotal = firstno * secondno;
break;
case "/":
intTotal = firstno / secondno;
break;
}

txtTotal.Text = intTotal.ToString();
}

The last line here is the most important code. In Visual Basic you don’t need to add ToString() function. But because C# just like c/c++ is very strict you are not allowed to directly display an integer to a TextBox.

Note: Due to the size or complexity of this submission, the author has submitted it as a .zip file to shorten your download time. After downloading it, you will need a program like Winzip to decompress it.

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