problem in select and insert statement C# asp.net

public partial class _Default : System.Web.UI.Page
{
    SqlConnection con = new SqlConnection("Data Source=JIMMY-PC;initial Catalog=jimmy;Integrated Security=true");
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button2_Click(object sender, EventArgs e)
    {
        Response.Redirect("home.aspx");
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        using (SqlCommand cnd = new SqlCommand("select LAST EmpID from Emplo"),con) //Error here
        {
            //How to store the selected field?
        }
        using (SqlCommand cmd = new SqlCommand("Insert into Emplo ([Name],[Password],[Designation],[Dept],[D O B],[Sex],[Address]) values (@Name,@pass,@des,@dept,@DOB,@Sex,@Address)", con))
        {
            cmd.Parameters.Add("@Name", SqlDbType.VarChar).Value = TextBox1.Text;
            //Here i need to add the selected number from the previous statement and insert here to the current row
            cmd.Parameters.Add("@des", SqlDbType.VarChar).Value = TextBox2.Text;
            cmd.Parameters.Add("@dept", SqlDbType.VarChar).Value = TextBox3.Text;
            cmd.Parameters.Add("@DOB", SqlDbType.SmallDateTime).Value = TextBox4.Text;
            cmd.Parameters.Add("@Sex", SqlDbType.VarChar).Value = RadioButton1.SelectedItem.Text;
            cmd.Parameters.Add("@Address", SqlDbType.VarChar).Value = TextBox5.Text;
            string sa = CreateRandomPassword(6);
            cmd.Parameters.Add("@pass", SqlDbType.VarChar).Value = sa;
            con.Open();
            cmd.ExecuteNonQuery();
            Response.Write("<script>alert('Registered successfully......!')</script>");
            Response.Write("<script>alert('Password is  " + Server.HtmlEncode(sa.ToString()) + "')</script>");
            
        }
        con.Close();
    }
    public static string CreateRandomPassword(int PasswordLength)
        { 
        string allowdChars = "0123456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNOPQRSTUVWXYZ";
        Random randNum = new Random();
        char[] chars = new char[PasswordLength];
        int allowedCharCount = allowdChars.Length;
        for (int j = 0; j < PasswordLength; j++)
        {
            chars[j] = allowdChars[(int)((allowdChars.Length) * randNum.NextDouble())];
        }
         return new string(chars);       
        }
    }