SQL update statement in C#

Question

I have table \"Student\"

   P_ID   LastName  FirstName  Address  City

   1        Hansen    Ola                
   2        Svendson   Tov         


        

Answer 1

String st = "UPDATE supplier SET supplier_id = " + textBox1.Text + ", supplier_name = " + textBox2.Text
            + "WHERE supplier_id = " + textBox1.Text;

        SqlCommand sqlcom = new SqlCommand(st, myConnection);
        try
        {
            sqlcom.ExecuteNonQuery();
            MessageBox.Show("update successful");
        }
        catch (SqlException ex)
        {
            MessageBox.Show(ex.Message);
        }