如何在文本框C＃中显示变量？

Question

hello i am facing a small problem and its by displaying a variable in the text box after checking another check box here is my code :

public partial class AccessoriesForm : Form
    {
        public AccessoriesForm()
        {
            InitializeComponent();
        }
        private void Total(object sender, EventArgs e)
        {
            double TotalPrice = 0;
            if (CagesCheckBox.Checked)
            {
                TotalPrice += 0.75;

                TotalPriceTextBox.Text = TotalPrice.ToString();
            }
        }

        private void pictureBox1_Click(object sender, EventArgs e)
        {

        }

// please help

Answer 1

I assume that your problem is you are defining TotalPrice inside of your method, so every time you see 0.75 in the TextBox .Put the definition outside of your method then it should work fine.

double TotalPrice = 0;
private void Total(object sender, EventArgs e)
{
     if (CagesCheckBox.Checked)
     {
         TotalPrice += 0.75;

         TotalPriceTextBox.Text = TotalPrice.ToString();
     }
}

Also don't forget to attach your event handler.You can use CheckedChanged event for this and you can attach it in your constructor:

public AccessoriesForm()
{
     InitializeComponent();
     CagesCheckBox.CheckedChanged += Total;
}