tiff image Fill is not deleting when we convert single tiff to 32 jpeg images and it gives ' The process cannot access the file because it is being used by another process. '

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C#

ASP.NET

C#4.0

this methode convert single tiff to 32 jpeg images

void IMAGE(string strFilePath)
{
string PathForCopy = string.Empty;
string folderName = string.Empty;
string TeacherId = string.Empty;
string directoryPath = string.Empty;
TeacherId = Convert.ToString(Session["TeacherId"]);
Bitmap bmap = null;
Session["UrlListForHe"] = null;
try
{
List<system.drawing.image> lst = new List<system.drawing.image>();

if (strFilePath != string.Empty)
{

string strFilename = System.IO.Path.GetFileNameWithoutExtension(strFilePath);
if (strFilename != "")
{
string strpagename = string.Empty;
if (File.Exists(strFilePath))
{
bmap = (Bitmap)System.Drawing.Image.FromFile(strFilePath);
int max = bmap.GetFrameCount(FrameDimension.Page);
float icount = (float)100 / max;
folderName = ConfigurationManager.AppSettings["FolderToViewPagesForEvaluator"].ToString();
PathForCopy = folderName + TeacherId;
if (!Directory.Exists(Server.MapPath(PathForCopy)))
{
Directory.CreateDirectory(Server.MapPath(PathForCopy));
}

int i;
for (i = 0; i < max; i++)
{
bmap.SelectActiveFrame(FrameDimension.Page, i);
strpagename = strFilename + "Page" + i.ToString().Trim();
lst.Add((System.Drawing.Image)bmap.Clone());
string url = Server.MapPath(PathForCopy) + "/00" + i.ToString() + ".Jpeg";
string Imgurl = PathForCopy + "/00" + i.ToString() + ".Jpeg";
(lst[i] as System.Drawing.Image).Save(url, ImageFormat.Jpeg);
strpath.Add(Imgurl);

}
Session["UrlListForHe"] = strpath;
lblPageCount.Text = strpath.Count().ToString();
TextBox1.Text = "1";
Image1.ImageUrl = strpath[0].ToString() + "?" + DateTime.Now.Ticks.ToString() ;
btnpre.Enabled = false;
btnnext.Enabled = true;
bmap.Dispose();
}
else
{
btnpre.Enabled = false;
btnnext.Enabled = false;
TextBox1.Text = "0";
lblPageCount.Text = "";
Image1.ImageUrl = "~/Images/FileNotFound.png";
bmap.Dispose();
}
}
else
{
btnpre.Enabled = false;
btnnext.Enabled = false;
TextBox1.Text = "0";
lblPageCount.Text = "";
Image1.ImageUrl = "~/Images/FileNotFound.png";
bmap.Dispose();
}
}
}


methode for deleting tiff image

public bool DeleteMarksAndCopyForRecheck(string roll, string subject, string bar,string path,out string msg)
       {
           // A= File Not Found !
           // B= Data Not deleted !
           // C=Exception !
           // D=Success !
           bool flag = false;
           msg = string.Empty;
           string str = "exec SetIsEvaluatedZero " + roll + " , '" + subject + "' , '" + bar + "'";
           path = HttpContext.Current.Server.MapPath(path);
           string ReplacePathForPopUp = ConfigurationManager.AppSettings["ReplacePathForCopyRecheckPopUp"];

           string Newpath = path.Replace(ReplacePathForPopUp, "");

           try
           {
               if (System.IO.File.Exists(Newpath))
               {
                   File.Delete(Newpath);
                   if (!(System.IO.File.Exists(Newpath)))
                   {
                       dt = ClsConObj.ExecuteProcedureREturnTable(str);
                       if (dt.Rows[0]["msg"].ToString().Trim() == "YES".Trim())
                       {
                           flag = true;
                           msg = "D";
                       }
                       else
                       {
                           flag = false;
                           msg = "B";
                       }
                   }
               }
               else
               {
                   flag = false;
                   msg = "A";
               }
           }
           catch (Exception ex)
           {
               flag = false;
               msg = "C";


           }
           return flag;
       }