using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; namespace { public partial class Form3 : Form { public Form3() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { int i; bool isValidInteger = int.TryParse(textBox1.Text, out i); if (!isValidInteger) { MessageBox.Show("Not a valid integer. Please enter once more"); textBox1.Focus(); return; } else { MessageBox.Show("valid integer"); textBox1.Focus(); } } } }
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