Question

System.InvalidCastException: "Не удалось привести тип объекта "System.Windows.Forms.TextBox" к типу "System.IConvertible"."

Код:

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 Jojo
{
public partial class Form1 : Form
{

public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
int n = Convert.ToInt32(textBox1);
if (n % 2 == 0)
{
label3.Text = "Yes";
}
else
{
label3.Text = "No";
}
}

}
}