saving password in encrypted form during registering in login form

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

namespace WindowsFormsApplication24
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        string msg;
        SqlConnection con = new SqlConnection("Data Source=ITC-002;Initial Catalog=Tempabc;User ID=sa;Password=********");
        SqlCommand cmd;
        DataSet ds = new DataSet();

        private void btn_login_Click(object sender, EventArgs e)
        {
            try
            {
                if (txtbx_name.Text == "" || txtbox_password.Text == "")
                {
                    MessageBox.Show(" Enter UserName and Password .");
                    return;
                }

                cmd = new SqlCommand("SELECT * FROM LoginDetails where Name='" + txtbx_name.Text + "' and Password='" + txtbox_password.Text + "'", con);
                SqlDataAdapter da = new SqlDataAdapter(cmd);
                da.Fill(ds);
                int i = ds.Tables[0].Rows.Count;
                if (i == 1)
                {
                    msg = "Welcome " + txtbx_name.Text;
                    this.Hide();
                    Form2 f2 = new Form2(msg);
                    f2.Show();
                    ds.Clear();

                }
                else
                {
                    MessageBox.Show("Not Registered User or Invalid Name/Password");
                    txtbox_password.Text = "";
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }

        }

        private void btn_register_Click(object sender, EventArgs e)
        {
            try
            {

                if (txtbx_name.Text == "" || txtbox_password.Text == "")
                {
                    MessageBox.Show(" Enter UserName and Password .");
                    return;
                }

                /** checking whether name exists **/
                cmd = new SqlCommand("SELECT * FROM LoginDETAILS where Name='" + txtbx_name.Text + "'", con);
                SqlDataAdapter da = new SqlDataAdapter(cmd);
                da.Fill(ds); //filling dataset
                int i = ds.Tables[0].Rows.Count; //checking rows count in dataset
                if (i > 0)
                {
                    MessageBox.Show("UserName " + txtbx_name.Text + " Already Exists..");
                    txtbox_password.Text = "";
                    ds.Clear(); //clearing dataset
                }
                else
                {
                    /** inserting name and password in table logindetails **/
                    cmd = new SqlCommand("INSERT INTO LOGINDETAILS VALUES('" + txtbx_name.Text + "','" + txtbox_password.Text + "')", con);
                    con.Open();
                    cmd.ExecuteNonQuery();
                    con.Close();

                    msg = "Registered Successfully \n Welcome " + txtbx_name.Text;
                    this.Hide(); //hiding form1
                    Form2 f2 = new Form2(msg);
                    f2.Show(); //showing form2 

                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
                con.Close();
            }

        }
    
    
    
    }
}