Answer Posted / azka sumbel

namespace prime_381
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
int a;
int result;
int i, j;

private void button1_Click(object sender, EventArgs
e)
{

a = Convert.ToInt32(textBox1.Text);
prime();
textBox1.Clear();
textBox1.Focus();

}
int flag;
public void prime()
{
flag = 1;

for (i = 2; i <= a / 2; i++)
{
if (a % i == 0)
flag = 0;
}
if (flag == 1)
MessageBox.Show("Prime.");
else
MessageBox.Show("not Prime");
}
}
}

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