private void check_radio()
        {
            Customers_Suppliers CS = new Customers_Suppliers();

            if (radioButton1.Checked)
            {
                con_ID = "Sup";
            }
            else if (radioButton2.Checked)
            {
                con_ID = "Cus";
            }
        }
        private void New_cust_Click(object sender, EventArgs e)
        {
            Customers_Suppliers CS = new Customers_Suppliers();

            check_radio();
            Random rnd = new Random();

            textBox1.Text = rnd.Next().ToString();
            if (con_ID == null)
            {
                MessageBox.Show("please select the Radiobutton");
            }
            else
            {
                CS.ID        = con_ID + "-" + textBox1.Text;
                CS.name      = comboBox1.Text;
                CS.type      = con_ID;
                CS.BirthDate = dateTimePicker1.Value.ToShortDateString();
                CS.phone     = int.Parse(textBox4.Text);
                CS.mobile    = int.Parse(textBox5.Text);
                CS.fax       = int.Parse(textBox6.Text);
                CS.Mail      = textBox7.Text;
                CS.website   = textBox2.Text;
                CS.Location  = textBox3.Text;
                CS.Comments  = textBox8.Text;
                if (CS.name == null)
                {
                    MessageBox.Show("name is empty");
                }
                else
                {
                    Company_ProjectEntities company_Project = new Company_ProjectEntities();
                    company_Project.Customers_Suppliers.Add(CS);
                    company_Project.SaveChanges();
                    MessageBox.Show($"New {CS.type} Added");
                }
            }
            EmptyForm();
            comboBox1_showList();
        }