[請益] 請問要怎樣設定警告訊息

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namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
double un, pn, uc, pc;
un = Convert.ToDouble(textBox1.Text);
pn = Convert.ToDouble(textBox2.Text);
pc = Convert.ToDouble(textBox3.Text);
uc = Convert.ToDouble(textBox4.Text);

double fena;
fena = un * pc / uc / pn*100;
label5.Text = fena.ToString()+"%";
}

private void button2_Click(object sender, EventArgs e)
{
textBox1.Text = "0";
textBox2.Text = "0";
textBox3.Text = "0";
textBox4.Text = "0";
label5.Text = "0";
}

private void Form1_Load(object sender, EventArgs e)
{

}
}
}

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