(need help) Simple problem in C#

[Paul]

Try this.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {

        private readonly int firstbox;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        public void button1_Click(object sender, EventArgs e)
        {
            int firstbox = Int32.Parse( textBox1.Text ); //here you input first value
            int firstvalue = Int32.Parse( textBox1.Text ); // this is to store the first value you write in textbox
            textBox1.Text = ""; //this is so that the textbox clears after the click
        }


        public void button2_Click(object sender, EventArgs e)
        {
            int secondbox = Int32.Parse( textBox1.Text );  //second input!
            int secondvalue = Int32.Parse( textBox1.Text ); //this is to store the second value that you input after buttonclick
            int result = firstbox + secondbox; //the sum
            int limitbox = Int32.Parse( textBox2.Text ); //limit!

            if (result <= limitbox)
            { //if you only write < and the MAX is 20, it will give you Invalid because 20 is not less than 20
                textBox1.Text = result.ToString();
            }
            else
            {
                MessageBox.Show("Invalid input");
            }


        }
    }
}

I made firstbox an instance variable otherwise it would have been out of context.

Remember to edit the namespace. You may also need to remove readonly.

[qais187]

Try this.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {

        private readonly int firstbox;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        public void button1_Click(object sender, EventArgs e)
        {
            int firstbox = Int32.Parse( textBox1.Text ); //here you input first value
            int firstvalue = Int32.Parse( textBox1.Text ); // this is to store the first value you write in textbox
            textBox1.Text = ""; //this is so that the textbox clears after the click
        }


        public void button2_Click(object sender, EventArgs e)
        {
            int secondbox = Int32.Parse( textBox1.Text );  //second input!
            int secondvalue = Int32.Parse( textBox1.Text ); //this is to store the second value that you input after buttonclick
            int result = firstbox + secondbox; //the sum
            int limitbox = Int32.Parse( textBox2.Text ); //limit!

            if (result <= limitbox)
            { //if you only write < and the MAX is 20, it will give you Invalid because 20 is not less than 20
                textBox1.Text = result.ToString();
            }
            else
            {
                MessageBox.Show("Invalid input");
            }


        }
    }
}

I made firstbox an instance variable otherwise it would have been out of context.

Remember to edit the namespace. You may also need to remove readonly.

It still says "The name 'firstbox' does not exist in the current context" im using xaml if its making a difference

[Paul]

It still says "The name 'firstbox' does not exist in the current context" im using xaml if its making a difference

Oh, you're using WPF. Yes it does, make a difference. Thought you were using winforms.

It shouldn't be out of context. I never receoeved that error in my debugger.