How to delete a specific file from folder using asp net

Question

here s the deal I got a datagridviewer which is called gridview1 and a fileupload1 when i upload a file it updates the gridview1 and table in database with the file name and path and stores the said file in folder  Mag     but now what i want to do is the reverse i got how to use the gridview to delete the table entry but deleting the file from folder  Mag  is not working have used the following code in C  or codebehind  protected void GridView1 Del object sender  EventArgs e          string DeleteThis   GridView1 SelectedRow Cells 0  Text      string   Files   Directory GetFiles   i  Website WebSite3 Mag          foreach  string file in Files                if  file ToUpper   Contains DeleteThis ToUpper                           File Delete file                       it gives me error       Object reference not set to an instance of an object      pls tell me what im doing wrong am new and don t have to in depth understanding of the platform so any and all help will be appreciated thanks in advance Mark   Here is the answer i found Thanks Tammy and everyone else for all the answers  Ok  here the deal target function delete file details from gridview and database table and file from project folder where the file is stored   in script section of gridview you would want to include  OnRowDeleting  FuntionName    Not  OnSelectedIndexChanged    FuntionName    or  OnRowDeleted  FuntionName    then in C  code codebehind   protected void FuntionName object sender  GridViewDeleteEventArgs e           storing value from cell         TableCell cell   GridView1 Rows e RowIndex  Cells 0       full path required         string fileName     i  Website WebSite3 Mag     cell Text         if fileName    null    fileName    string Empty               if  System IO File Exists fileName                         System IO File Delete fileName                          And just for added reference for those who want to learn  OnRowDeleting  FuntionName  is for just before deleting a row you can cancel deleting or run functions on the data like i did  OnRowDeleted  FuntionName  it directly deletes

User · Answer

In my project i am using ajax and i create a web method in my code behind like this

in front

 $("#attachedfiles a").live("click", function () {
            var row = $(this).closest("tr");
            var fileName = $("td", row).eq(0).html();
            $.ajax({
                type: "POST",
                url: "SendEmail.aspx/RemoveFile",
                data: '{fileName: "' + fileName + '" }',
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: function () { },
                failure: function (response) {
                    alert(response.d);
                }
            });
            row.remove();
        });

in code behind

        [WebMethod]
        public static void RemoveFile(string fileName)
        {
            List<HttpPostedFile> files = (List<HttpPostedFile>)HttpContext.Current.Session["Files"];
            files.RemoveAll(f => f.FileName.ToLower().EndsWith(fileName.ToLower()));

            if (System.IO.File.Exists(HttpContext.Current.Server.MapPath("~/Employee/uploads/" + fileName)))
            {
                System.IO.File.Delete(HttpContext.Current.Server.MapPath("~/Employee/uploads/" + fileName));
            }
        }

i think this will help you.

User · Answer

string sourceDir     c  current   string backupDir     c  archives 2008    try       string   picList   Directory GetFiles sourceDir     jpg        string   txtList   Directory GetFiles sourceDir     txt            Copy picture files       foreach  string f in picList                   Remove path from the file name           string fName   f Substring sourceDir Length   1               Use the Path Combine method to safely append the file name to the path              Will overwrite if the destination file already exists          File Copy Path Combine sourceDir  fName   Path Combine backupDir  fName   true                 Copy text files       foreach  string f in txtList                    Remove path from the file name           string fName   f Substring sourceDir Length   1            try                          Will not overwrite if the destination file already exists              File Copy Path Combine sourceDir  fName   Path Combine backupDir  fName                          Catch exception if the file was already copied           catch  IOException copyError                        Console WriteLine copyError Message                           Delete source files that were copied       foreach  string f in txtList                File Delete f             foreach  string f in picList                File Delete f            catch  DirectoryNotFoundException dirNotFound        Console WriteLine dirNotFound Message

User · Answer

Delete any or specific file type for example   bak   from a path  See demo code below -  class Program                   static void Main string   args                                Specify the starting folder on the command line  or in              TraverseTree ConfigurationManager AppSettings  folderPath                     Specify the starting folder on the command line  or in                 Visual Studio in the Project  gt  Properties  gt  Debug pane                TraverseTree args 0                 Console WriteLine  Press any key                Console ReadKey                           public static void TraverseTree string root                             if  string IsNullOrWhiteSpace root                   return                  Data structure to hold names of subfolders to be                examined for files              Stack lt string gt  dirs   new Stack lt string gt  20                if   System IO Directory Exists root                                     return                                 dirs Push root                while  dirs Count  gt  0                                    string currentDir   dirs Pop                    string   subDirs                  try                                           subDirs   System IO Directory GetDirectories currentDir                                             An UnauthorizedAccessException exception will be thrown if we do not have                    discovery permission on a folder or file  It may or may not be acceptable                     to ignore the exception and continue enumerating the remaining files and                     folders  It is also possible  but unlikely  that a DirectoryNotFound exception                     will be raised  This will happen if currentDir has been deleted by                    another application or thread after our call to Directory Exists  The                     choice of which exceptions to catch depends entirely on the specific task                     you are intending to perform and also on how much you know with certainty                     about the systems on which this code will run                  catch  UnauthorizedAccessException e                                            Console WriteLine e Message                       continue                                        catch  System IO DirectoryNotFoundException e                                            Console WriteLine e Message                       continue                                         IEnumerable lt FileInfo gt  files   null                  try                                             get only  bak file                     var directory   new DirectoryInfo currentDir                       DateTime date   DateTime Now AddDays -15                       files   directory GetFiles    bak   Where file   gt  file CreationTime  lt   date                                         catch  UnauthorizedAccessException e                                            Console WriteLine e Message                       continue                                        catch  System IO DirectoryNotFoundException e                                            Console WriteLine e Message                       continue                                            Perform the required action on each file here                     Modify this block to perform your required task                  foreach  FileInfo file in files                                            try                                                      Perform whatever action is required in your scenario                          file Delete                            Console WriteLine   0    1    2  was successfully deleted    file Name  file Length  file CreationTime                                                 catch  System IO FileNotFoundException e                                                       If file was deleted by a separate application                             or thread since the call to TraverseTree                              then just continue                          Console WriteLine e Message                           continue                                                                      Push the subdirectories onto the stack for traversal                     This could also be done before handing the files                  foreach  string str in subDirs                      dirs Push str                                               for more reference - https   msdn microsoft com en-us library bb513869 aspx

User · Answer

Check the GridView1 SelectedRow is not null   if  GridView1 SelectedRow    null  return  string DeleteThis   GridView1 SelectedRow Cells 0  Text

User · Answer

This is how I delete files  if   System IO File Exists fileName                                          System IO File Delete fileName       Also make sure that the file name you are passing in your delete  is the accurate path  EDIT  You could use the following event instead as well or just use the code in this snippet and use in your method  void GridView1 SelectedIndexChanged Object sender  EventArgs e              Get the currently selected row using the SelectedRow property      GridViewRow row   CustomersGridView SelectedRow         Debug this line and see what value is returned if it contains the full path        If it does not contain the full path then add the path to the string      string fileName   row Cells 0  Text       if fileName    null    fileName    string empty               if  System IO File Exists fileName              System IO File Delete fileName

[c#] How to delete a specific file from folder using asp.net

Examples related to c#

Examples related to asp.net