Rename a Image/File in C#

Step 3.Double Click on Open Button “button_click” event generated. After that simply put this code on your form1.cs page.
Code For Rename Image/File in C#//Change//Replace Old Image Name From new Image name in C#

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.IO;
namespace ImageGalleryListView
{
    public partial class Form1: Form
    {

       //Dynamically create Image List at runtime
        System.Windows.Forms.ImageList myImageList = new ImageList();
       //declare one int type variable count for index of image 
        int count = 0;
       //Declare one string Variable for store New Image Name
        public string ImageNewName="";
        OpenFileDialog ofd = new OpenFileDialog() { Multiselect = true, ValidateNames = true, Filter = 
         "JPG|*jpg|JPEG|*.jpeg|PNG|*.png" };

        public Form1()
        {
            InitializeComponent();
            listViewFile.SmallImageList = myImageListSmall;
            listViewFile.SmallImageList = myImageListLarge;
            this.KeyPreview = true;
        }

        private void buttonOpen_Click(object sender, EventArgs e)
        {
           //set the size of imagelist
            myImageList.ImageSize = new Size(50,50);
            myImageListSmall.ImageSize = new Size(32, 32);
            myImageListLarge.ImageSize = new Size(80, 80);
            if (ofd.ShowDialog() == DialogResult.OK)
            {
                listViewFile.Items.Clear();
                foreach (string fileName in ofd.FileNames)
                {
                         
                          FileInfo fi = new FileInfo(fileName);
                    FileInfo fileinfo = new FileInfo(fileName);
                    using (FileStream stream = new FileStream(fi.FullName, FileMode.Open, FileAccess.Read))
                    {
                        myImageList.Images.Add(Image.FromStream(stream));
                     }
                    listViewFile.LargeImageList = myImageList;
                   
                    listViewFile.Items.Add(new ListViewItem { ImageIndex = count, Text = fi.Name,  Tag = fi.FullName 
               });
                    count++;
                }
            }


        }
       
     
      
    
         /// <summary>
        /// Here i have create dynamically shortcut menu Contextmenu
        /// Add New menuItem "Rename"
        /// Create OnMenuItemClick event on MenuItem Click
        ///
        /// </summary>

        private void listViewFile_MouseClick(object sender, MouseEventArgs e)
        {
            
            ContextMenu cm = new ContextMenu();
            listViewFile.ContextMenu = cm;
            var mi = new MenuItem("Rename");
          
            mi.MenuItems.Add(mi);
            mi.Click += OnMenuItemClick;
            cm.MenuItems.Add(mi);
            
        }
     //Rename Image Name
    //Don't Forget to listview LabelEdit property allow to true by default labelEdit property false
    private void OnMenuItemClick(object sender, EventArgs e)
        {
            listViewFile.SelectedItems[0].BeginEdit();
        }
    
        /// <summary>
       /// If you want change system image name write this code
        ///  Here i have to create event.Like Normal listvView AfterLabelEdit event.
        /// you can use this event whenever you have to require some action/operation on selected item 
        ///Here replace old image name from NewImage
        /// you have to fired this event and perform some action
        ///store edit image in ImageNewName string Variable
        /// whatever you are select item store in  ListViewItem object
        /// fileInfo.MoveTo replace old Image of system from New Image Name
        /// </summary>

     private void listViewFile_AfterLabelEdit(object sender, System.Windows.Forms.LabelEditEventArgs e)
        {
           if (e.Label == null)
              return;
            ImageNewName = Convert.ToString(e.Label);
            ListViewItem item = listViewFile.SelectedItems[0];
            FileInfo fileinfo = new FileInfo(item.Tag.ToString());
            fileinfo.MoveTo(fileinfo.Directory.FullName+"\\"+ImageNewName+fileinfo.Extension);
            listViewFile.Items[0].Text = ImageNewName;
        }
    }
}

Demo