哪位大神帮忙看看这个窗体程序哪里错了
using System;using System.Collections.Generic;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace WindowsFormsApplication4{ public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void textBox2_TextChanged(object sender, EventArgs e) { } private void button1_Click(object sender, EventArgs e) { int a, b, c,j,i=0; a = int.Parse(textBox1.Text); b = int.Parse(textBox2.Text); for (c = a; c <= b;c++); { if (c % 3 == 0 && c % 5 == 0 && c % 100 != 0); textBox3 .Text =textBox3 .Text +c.ToString()+'\t'; i++; if (i % 5 == 0) ; { textBox3 .Text +="\r\n"; } } } } }