How to show images from database into Picture box?

create table imgupload(ID int IDENTITY(1,1),cntnt varbinary(max))

using System.Data;
using System.Data.SqlClient;
using System.Collections;
using System.IO;

namespace DisplayBytesImage
{
    public partial class Form1 : Form
    {
        //Please change connection string using below code
        SqlConnection sqlcon = new SqlConnection(@"Server=RAVI-PC\SQLEXPRESS;database=test;uid=xxxx;pwd=yyyy;");
        SqlCommand sqlcmd = new SqlCommand();
        ArrayList alist = new ArrayList();
        DataTable dt = new DataTable();
        SqlDataAdapter da = new SqlDataAdapter();
        int i = 0;
        int filecount = 0;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //For testing use below method to insert some images in that table to test
            //InsertImageToTable();

            //create temp directory to store files from database bytes
            string tmppath = Path.GetDirectoryName(Application.ExecutablePath) + "\\tmpdir";
            if (!System.IO.Directory.Exists("tmppath"))
            {
                System.IO.Directory.CreateDirectory(tmppath);
            }

            //Convert bytes into image and store in temperory path
            sqlcon.Open();
            sqlcmd = new SqlCommand("select * from imgupload", sqlcon); //change table name as per your record
            da = new SqlDataAdapter(sqlcmd);
            dt = new DataTable();
            da.Fill(dt);
            sqlcon.Close();

            if (dt.Rows.Count > 0)
            {
                for (int i = 0; i <= dt.Rows.Count - 1; i++)
                {
                    Byte[] byt = (Byte[])dt.Rows[i]["cntnt"]; //change here your field name instead of cntnt
                    System.IO.File.WriteAllBytes(tmppath + "\\" + i + ".jpg", byt);
                }

                //Specify Source folder path here
                LoadImage(tmppath);
            }
        }
        //Load images from temp directory to picture box 
        void LoadImage(string path)
        {
            System.IO.DirectoryInfo inputDir = new System.IO.DirectoryInfo(path);
            try
            {
                if ((inputDir.Exists))
                {

                    //Get Each jpg files from a source folder and stored in the arraylist
                    System.IO.FileInfo file = null;
                    foreach (System.IO.FileInfo eachfile in inputDir.GetFiles())
                    {
                        file = eachfile;
                        if (file.Extension.ToLower() == ".jpg")
                        {
                            alist.Add(file.FullName);
                            //Store file count here 
                            filecount = filecount + 1;
                        }
                    }
                    //Initally show first image in the picture box
                    pictureBox1.Image = Image.FromFile(alist[0].ToString()); ;
                    i = 0;
                }
            }
            catch (Exception ex)
            {

            }
        }

        private void btnNext_Click(object sender, EventArgs e)
        {
            //check next position image is have or not
            if (i + 1 < filecount)
            {
                pictureBox1.Image = Image.FromFile(alist[i + 1].ToString());
                i = i + 1;
            }
        }

        private void btnPrevious_Click(object sender, EventArgs e)
        {
            //check previous position image is have or not
            if (i - 1 >= 0)
            {
                pictureBox1.Image = Image.FromFile(alist[i - 1].ToString());
                i = i - 1;
            }
        }

        //Testing insert image in table
        void InsertImageToTable()
        {
            try
            {
                sqlcon.Open();
                byte[] cnt = null;
                //Source directory to read files change path as per your system
                DirectoryInfo di = new DirectoryInfo("D:\\imgfolder");
                //if you want only jpg files then filter it
                FileInfo[] ArrFi = di.GetFiles("*.jpg");
                foreach (FileInfo fi in ArrFi)
                {
                    cnt = FileToByteArray(fi.FullName);
                    sqlcmd = new SqlCommand("insert into imgupload values (@Img)", sqlcon);               
                    sqlcmd.Parameters.Add("@Img", cnt);
                    sqlcmd.ExecuteNonQuery();
                }
            }
            catch (Exception ex)
            {

            }
            finally
            {
                sqlcon.Close();
            }
        }
        public byte[] FileToByteArray(string fname)
        {
            byte[] cnt = null;
            try
            {
                System.IO.FileStream fs = new System.IO.FileStream(fname, System.IO.FileMode.Open, System.IO.FileAccess.Read);
                System.IO.BinaryReader br = new System.IO.BinaryReader(fs);
                long tb = new System.IO.FileInfo(fname).Length;
                cnt = br.ReadBytes((Int32)tb);
                fs.Close();
                fs.Dispose();
                br.Close();
            }
            catch (Exception ex)
            {
            }
            return cnt;
        }        
    }
}