Idea for Deleteing the selected item [resolved]

The cose workes perfectly, but just one glich, I cant seem to figur out how to implement a function ot method or sql statement to delete the selected item ( which is the name of the member, while the selected item is displayed in combobox,by clicking the delete button it should delete the whole record about the member.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace WindowsFormsApplication2
{
    public partial class frmDeleteMember : Form
    {
        public frmDeleteMember() 
        {
            InitializeComponent();
        }

        SqlDataAdapter da;
        DataSet ds = new DataSet();

        private void frmDeleteMember_Load(object sender, EventArgs e)
        {
            String conStr = "Data Source=My-PC\\SQLEXPRESS;Initial Catalog=TESTSUB;Integrated Security=True";
            SqlConnection con = new SqlConnection(conStr);
            SqlCommand cmd = con.CreateCommand();
            cmd.CommandType = CommandType.Text;
            cmd.CommandText = "SELECT * FROM members";
            da = new SqlDataAdapter(cmd);
            da.Fill(ds, "members");
            this.cmbDeleteMember.SelectedIndexChanged -= new System.EventHandler(this.cmbDeleteMember_SelectedIndexChanged);
            cmbDeleteMember.DataSource = ds.Tables["members"];
            cmbDeleteMember.DisplayMember = "FullName";
            cmbDeleteMember.ValueMember = "ID";
            this.cmbDeleteMember.SelectedIndexChanged += new System.EventHandler(this.cmbDeleteMember_SelectedIndexChanged);
        }
 
        private void cmbDeleteMember_SelectedIndexChanged(object sender, EventArgs e)
        {
            MessageBox.Show("Members Primary Key is \"" + cmbDeleteMember.SelectedValue + "\"");
        }

        private void btnDel_Click(object sender, EventArgs e)
        {
            // Idea needed for deleteing the selected info "row" about member by clicking this button
        }
    }
}