c# - 不能加整数

Question

好的，我是 C# 的新手，我想添加两个用户输入到文本框中的值。这是我的代码，我收到“val1 + val2”的错误。如何添加这些值？如果之前有人问过这个问题，我真的很抱歉，但我已经搜索过答案，但我就是找不到。谢谢 :)。

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 Csharp_Calculator
{

    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void buttonAdd_Click(object sender, EventArgs e)
        {
            int val1 = Convert.ToInt32(textBox1.Text);
            int val2 = Convert.ToInt32(textBox2.Text);
            textBoxAns.Text = val1 + val2;
        }

        private void buttonSub_Click(object sender, EventArgs e)
        {
            int val1 = Convert.ToInt32(textBox1.Text);
            int val2 = Convert.ToInt32(textBox2.Text);
            textBoxAns.Text = val1 + val2;
        }

        private void buttonDivide_Click(object sender, EventArgs e)
        {
            int val1 = Convert.ToInt32(textBox1.Text);
            int val2 = Convert.ToInt32(textBox2.Text);
            textBoxAns.Text = val1 + val2;
        }

        private void buttonRefresh_Click(object sender, EventArgs e)
        {
            textBox1.Text = "";
            textBox2.Text = "";
            textBoxAns.Text = "";
        }
    }
}

Answer 1

尝试这样的事情:

textBoxAns.Text = (val1 + val2).ToString();