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private void button1_Click(object sender, EventArgs e)
{
listBox1.Items.Clear();
for (int i = 1; i < 10; i++)
{
string s = "";
for (int j =1; j <=i; j++)
{
s+= i + "*" + j + "=" + i * j+" ";
}
listBox1.Items.Add(s);
}
}
private void button2_Click(object sender, EventArgs e)
{
this.Close();
}