在线等回复
namespace currency
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{
this.textBox2.ReadOnly = true;
this.button2.Enabled = false;
this.button3.Enabled = false;
}

private void button1_Click(object sender, EventArgs e)
{
if (this.textBox1.Text.Trim().Length == 0)
{
MessageBox.Show( "wrong.! ");
}
}
private void radio1_checked(object sender, EventArgs e)
{
if (radioButton1.Checked)
{
this.button2.Enabled = true;
this.button3.Enabled = true;
}
}
}
}

1.当TEXTBOX1为空时,MESSAGEBOX不能显示
2.当选定RADIOBUTTON1后,BUTTON2和BUTTON3不能使用

请问一下这是为什么啊,?

[解决办法]
我按照你的代码 测试通过

1.当TEXTBOX1为空时,MESSAGEBOX不能显示//你确定this.textBox1.Text.Trim().Length == 0

2.当选定RADIOBUTTON1后,BUTTON2和BUTTON3不能使用//radioButton1_CheckedChanged事件