创建程序，它使用二进制文件方法来写文件，创建用于存储人姓名年龄会员资格的结构，将这些信息写入文件。

struct Hunam {
public string name;
public int age;
public string permission;
}

private void button2_Click(object sender, EventArgs e)
{
Hunam hunam;
hunam.name = "张三";
hunam.age = 22;
hunam.permission = "admin";
System.IO.FileStream writeFileStream = new System.IO.FileStream(@"aa.dat", System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.Write);
System.IO.BinaryWriter bw = new System.IO.BinaryWriter(writeFileStream);
bw.Write(hunam.name + "|" + hunam.age.ToString() + "|" + hunam.permission);
bw.Flush();
bw.Close();
}