Show image in picturebox using path saved in database

I got a table 'IMAGES' with fields 'img_username' , 'img_image_path. From my form I can upload image path to database and copy the image to a specific folder. Now I want to show the image in a pictureboxaccording the username I am giving. I will share the code so far iwritten. Please help. Now am getting error when I try to show image by giving a username.An unhandled exception of type 'System.IO.FileNotFoundException' occurred in System.Drawing.dll... This is the error showing at line 49. Is there any better way to do it?

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Configuration;
using System.Data.SqlClient;
using System.IO;
namespace ImageSaving
{
public partial class Form1 : Form
{
SqlConnection con = new SqlConnection(ConfigurationManager.AppSettings.Get("connectionstring").ToString());
string displayimg, filepath;
string folderpath = @"D:\Images\";
OpenFileDialog open = new OpenFileDialog();
SqlCommand cmd;
public Form1()
{
InitializeComponent();
}
//show image button
private void btn_ShowImage_Click(object sender, EventArgs e)
{
string sql = "select * from images where img_username=@username";
SqlCommand cmdrtrv = new SqlCommand(sql, con);
cmdrtrv.Parameters.AddWithValue("@username", txt_UserName.Text);
try
{
if (con.State == ConnectionState.Closed)
{
con.Open();
}
using (SqlDataReader reader = cmdrtrv.ExecuteReader())
{
if (reader.Read())
{
string path = @reader["img_path"].ToString();
pctbx_UserImage.Image = Image.FromFile("" + reader["path"].ToString());
}
}
}
finally
{
con.Close();
}
}
private void Form1_Load(object sender, EventArgs e)
{
con.Open();
}
//Search image button for upload
private void btn_SearchImage_Click(object sender, EventArgs e)
{
open.Filter = "Image Files(*.jpg; *.jpeg; *.gif; *.bmp)|*.jpg; *.jpeg; *.gif; *.bmp|all files|*.*";
if(open.ShowDialog()==DialogResult.OK)
{
displayimg = open.SafeFileName;
txt_ImagePath.Text = open.FileName;
//Bitmap img = new Bitmap(open.FileName);
pctbx_UserImage.Image = new Bitmap(open.FileName);
filepath = open.FileName;
}
}
//Upload button
private void btn_Upload_Click(object sender, EventArgs e)
{
if(filepath=="")
{
cmd.Parameters.AddWithValue("@Path", "");
}
else
{
cmd = new SqlCommand("insert into images values(@UserName,@Path)",con);
cmd.CommandType = CommandType.Text;
cmd.Parameters.AddWithValue("@UserName", txt_UserName.Text);
cmd.Parameters.AddWithValue("@Path", folderpath+Path.GetFileName(open.FileName));
File.Copy(filepath, Path.Combine(folderpath, Path.GetFileName(open.FileName)),true);
if(con.State==ConnectionState.Closed)
{
con.Open();
}
cmd.ExecuteNonQuery();
MessageBox.Show("Image Saved");
con.Close();
}
}
}
}