Delete Uploaded Image After Sending An Email

Question

I want to delete the image after sending the image by email. But I get one exception as follows:

The process cannot access the file 'C:\Users\LTP-Dell-72\source\repos\Demo2\Demo2\Images\Koala.jpg' because it is being used by another process.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Net.Mail;
using System.IO;
using System.Text;
using System.Net.Mime;
namespace Demo2
{
public partial class Email : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btn_send_Click(object sender, EventArgs e)
{
try
{
MailMessage message = new MailMessage();
message.To.Add(txtEmail.Text);// Email-ID of Receiver
message.Subject = txtSubject.Text;// Subject of Email
message.From = new
System.Net.Mail.MailAddress("****");// Email-ID of Sender
message.IsBodyHtml = true;
message.AlternateViews.Add(Mail_Body());
SmtpClient SmtpMail = new SmtpClient();
SmtpMail.Host = "smtp.gmail.com";//name or IP-Address of Host used for SMTP transactions
SmtpMail.Port = 587;//Port for sending the mail
SmtpMail.Credentials = new
System.Net.NetworkCredential("****","****");//username/password of network, if apply
SmtpMail.DeliveryMethod = SmtpDeliveryMethod.Network;
SmtpMail.EnableSsl = true;
SmtpMail.ServicePoint.MaxIdleTime = 0;
SmtpMail.ServicePoint.SetTcpKeepAlive(true, 2000, 2000);
message.BodyEncoding = Encoding.Default;
message.Priority = MailPriority.High;
SmtpMail.Send(message); //Smtpclient to send the mail message
//message = null;
message.Dispose();
String FileName = fileUpload1.PostedFile.FileName;
string path1 = Server.MapPath("~/Images/");
string path = path1 + FileName;
//FileInfo TheFile = new FileInfo(path);
//if (TheFile.Exists)
//{
File.Delete(path); // It not works if file is used in another proces
//}
Response.Write("Email has been sent");
}
catch (Exception ex)
{ Response.Write("Failed"); }
}
private AlternateView Mail_Body()
{
String FileName = fileUpload1.PostedFile.FileName;
string path1 = Server.MapPath("~/Images/");
string path = path1 + FileName;
LinkedResource Img = new LinkedResource(path, MediaTypeNames.Image.Jpeg);
Img.ContentId = "MyImage";
string str = @"
<table>
<tr>
<td> '" + txtmessagebody.Text + @"'
</td>
</tr>
<tr>
<td>
<img src=cid:MyImage id='img' alt='' width='100px' height='100px'/>
</td>
</tr></table>
";
AlternateView AV =
AlternateView.CreateAlternateViewFromString(str, null, MediaTypeNames.Text.Html);
AV.LinkedResources.Add(Img);
return AV;
}
}
}