How can I add the value of textbox2 and textbox4?

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I want to add the values of textbox2 and textbox4 and the sum will show in textbox9 when I click the button1 total.

what code should I put in button1?

What I have tried:

C#

namespace LogIn
{
    public partial class Form3 : Form
    {
        public Form3()
        {
            InitializeComponent();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            // Clear the Textboxes and the total labels/
            textBox2.Text="";
            textBox4.Text="";
            textBox9.Text = "";
            textBox1.Text="";
            textBox3.Text="";
            // reset the focus
            textBox9.Focus();
            textBox2.Focus();
            textBox4.Focus();
            textBox3.Focus();
            textBox1.Focus();

        }

        private void button4_Click(object sender, EventArgs e)
        {
            DialogResult iLogOut;

            iLogOut = MessageBox.Show("Do you want to Log Out?", "Leave?", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
            if (iLogOut == DialogResult.Yes)
            {
                Application.Exit();
            }
        }

        private void button5_Click(object sender, EventArgs e)
        {
            try
            {
                const double fries_small = 25;
                const double fries_large = 40;
                const double fries_bucket = 70;
                double friesQuantity;
                double friesTotal; // fries amount * cost
                friesQuantity = int.Parse(textBox1.Text);
                if (checkBox1.Checked == true)
                {
                    friesTotal = friesQuantity * fries_small;
                    textBox2.Text = friesTotal.ToString("c");
                }
                else if (checkBox2.Checked == true)
                {
                    friesTotal = friesQuantity * fries_large;
                    textBox2.Text = friesTotal.ToString("c");
                }
                else if (checkBox3.Checked == true)
                {
                    friesTotal = friesQuantity * fries_bucket;
                    textBox2.Text = friesTotal.ToString("c");
                }
                
                else
                {
                    MessageBox.Show("Fill the order form please");
                }
            }

            catch (Exception)
            {
                MessageBox.Show("Please fill out the order form");
            }
        }



        private void Form3_Load(object sender, EventArgs e)
        {
            MessageBox.Show("Original flavored fries and affordable drinks available, Order Now!");
        }

        private void button6_Click(object sender, EventArgs e)
        {
            try
            {
        const double bev_water = 20;
        const double bev_icedtea = 25;
        const double bev_coke = 30;
        double bevQuantity = int.Parse(textBox3.Text);
        double beveragesTotal; // beverage amount * cost
        
            if (checkBox4.Checked == true)
                {
                    beveragesTotal = bevQuantity * bev_water;
                    textBox4.Text = beveragesTotal.ToString("c");
                }
                else if (checkBox5.Checked == true)
                {
                    beveragesTotal = bevQuantity * bev_icedtea;
                    textBox4.Text = beveragesTotal.ToString("c");
                }
                else if (checkBox6.Checked == true)
                {
                    beveragesTotal = bevQuantity * bev_coke;
                    textBox4.Text = beveragesTotal.ToString("c");
                }
             else
                {
                    MessageBox.Show("Fill the order form please");
                }
            }
             catch(Exception)
            {
                MessageBox.Show("Please fill out the order form");
             }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            
        }

        }

    }

Posted 19-Mar-17 12:15pm

Sheena Sofia Tegerero

Updated 19-Mar-17 19:54pm

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Comments

[no name] 19-Mar-17 19:01pm

You take the text from the textboxes, convert the strings to numbers, then use the + operator to add the numbers together and set the textbox text property to the sum.

3 solutions

Solution 3

First Convert textbox value into numeric value(like int,double.)
Ex- int val1 = Convert.ToInt32(TextBox2.Text);
int val2 = Convert.ToInt32(TextBox2.Text);

Second Add those value...using a temp variable
Ex- int result = val1+val2;

Third Assign this result into TextBox
Ex- TextBox3.Text= result.ToString();

Or
In Only One Line

TextBox3.Text = (Convert.ToInt32(TextBox2.Text) + Convert.ToInt32(TextBox2.Text));

Posted 19-Mar-17 19:54pm

VIkram Barnwal

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Mehedi Shams · Accepted Answer · 2017-03-19T13:30:00

Hi Sheena,

The code itself needs a lot of good reshaping.

The first thing you need to do is give a good name to the textboxes and buttons. Remember, a good name should sufficiently describe the actions they are up to; it reduces commenting efforts.

Suggestions E.g.:

button2 -> Rename as 'ResetBtn'
button4 -> Rename as 'ExitBtn'
button5 -> Rename as 'FriesOrderBtn'
button6 -> Rename as 'BeveragesOrderBtn'
button1 -> Rename as 'TotalPriceBtn'
checkBox1 -> Rename as 'SmallFriesCheckBox'
.....................
.....................
etc.

The following code makes unnecessary jumps between the textboxes:

// reset the focus
textBox9.Focus();
textBox2.Focus();
textBox4.Focus();
textBox3.Focus();
textBox1.Focus();

This can simply be just the last line; the first four lines are causing unnecessary trips between the controls.

textBox1.Focus();

Another thing you need to do is bring all constants at the top of the code; it looks unprofessional if you put them inside methods. Constants are created at compile time, not at runtime. It is not like they are created when you move to the method; they are created at the start of the program.

Another suggestion is, wrap your code in try-catch blocks. You never know what might happen in runtime.

Finally, the problem at your hand - adding the price of fries and beverages. You already used the solution (int.Parse(textBox1.Text)), you can use the same.

private void button1_Click(object sender, EventArgs e)
{
	// Check if prices for fries and beverages are calculated yet. If not then return.
	if (string.IsNullOrEmpty(textBox2.Text) || string.IsNullOrEmpty(textBox4.Text))
        return;

	try
    {
        int Total = int.Parse(textBox2.Text) + 	int.Parse(textBox4.Text);
	    textBox9.Text = Total.ToString();
    }
    catch (FormatException Ex)
    {
        MessageBox.Show("Expecting numbers in the price boxes of fries and beverages.
                         Error msg: " + Ex.Message);
    }
}

Bryian Tan · Accepted Answer · 2017-03-19T13:00:00

1. convert the currency string into number
2. sum the two number
3. convert it back into currency

C#

double beveragesTotal, friesTotal;

double.TryParse(textBox4.Text, System.Globalization.NumberStyles.Currency, 
System.Globalization.CultureInfo.CurrentCulture.NumberFormat, out beveragesTotal);

double.TryParse(textBox2.Text, System.Globalization.NumberStyles.Currency, 
System.Globalization.CultureInfo.CurrentCulture.NumberFormat, out friesTotal);

textBox9.Text = (beveragesTotal + friesTotal).ToString("c");

How can I add the value of textbox2 and textbox4?

3 solutions

Solution 2

Solution 1

Solution 3

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