private void button1_Click(object sender, EventArgs e)
{
TableStudent s = new TableStudent();
s.Email = textBox3.Text;
s.Name = this.textBox2.Text;
s.Id = Convert.ToInt32(textBox1.Text);
crmEntities crmEntities = new crmEntities();
crmEntities.TableStudents.Add(s);
crmEntities.SaveChanges();
if (crmEntities.TableStudents.Any(n => n.Id == s.Id))
{
MessageBox.Show(s.Id + "Added!");
}
}