Saving Image from PictureBox

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C#

.NET

Hi friends,

This is my code....

On Save Button click i want to save the Image...

Now what problem im facing is when i save th image it is saving blank.
When i open the image it is showing blank...

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;


namespace WindowsFormsApplication3
{
    public partial class Form1 : Form
    {
        
        Pen mypen;
        bool bmousedown = false;
        Point prevpoint;
        Graphics g;
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            mypen = new System.Drawing.Pen(System.Drawing.Color.Black);
            g = pictureBox1.CreateGraphics();
            mypen.DashStyle = System.Drawing.Drawing2D.DashStyle.Solid;
            mypen.Color = Color.Black;
            mypen.Width = 1.0f;
        }

        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
        {
            prevpoint = e.Location;
            bmousedown = true;
        }

        private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
        {
            bmousedown = false;
        }

        private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
        {
            if (bmousedown)
            {
                Point thispoint = e.Location;
                if (prevpoint.X == 0 && prevpoint.Y == 0)
                {
                    prevpoint = thispoint;
                    return;
                }
                g.DrawLine(mypen, thispoint.X, thispoint.Y, prevpoint.X, prevpoint.Y);
                g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                prevpoint = thispoint;
            }
        }

        private void btnSave_Click(object sender, EventArgs e)
        {
            using (SaveFileDialog sfdlg = new SaveFileDialog())
            {
                 sfdlg.Title="Save Dialog";
                sfdlg.Filter="Bitmap Images (*.bmp)|*.bmp|All files(*.*)|*.*";
                if(sfdlg.ShowDialog(this)==DialogResult.OK)
                {
                    using (Bitmap bmp = new Bitmap(pictureBox1.Width,pictureBox1.Height))
                    {
                        pictureBox1.DrawToBitmap(bmp,new Rectangle(0,0,bmp.Width ,bmp.Height));
                        pictureBox1.Image = new Bitmap(pictureBox1.Width, pictureBox1.Height);
                        pictureBox1.Image.Save("c://cc.Jpg");
                        bmp.Save(sfdlg.FileName);
                        MessageBox.Show("Saved Successfully.....");
                        
                    }
                }
            }
            

        }
    }
}