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Save and read file from server in Asp.Net using .Net 2.0.

Author: Zunnair
Download Source Code : 737_Sample.zip

In this article I will try to explain, how you can save and read file from server i.e. ‘wwwroot’ and access file attributes that resides on server in ASP.Net


The technique for doing the above mentioned tasks is very simple all you have to do is create a new website in VS and add the Label control, File Upload control, Text Box control and finally the Button Control on your Default.aspx page. The code for your web form will be look like as follows:


 

 

After adding controls, now add the code on cmdShowContents event:

 

 

VB.Net

 

Protected Sub cmdShowContents_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles cmdShowContents.Click

 

ViewState("fileName") = fuUploadFile.FileName

 If Not fuUploadFile.PostedFile Is Nothing Then

 fuUploadFile.PostedFile.SaveAs("C:\Inetpub\wwwroot\ReadAllTextPro\" & fuUploadFile.FileName)

 txtDisplayFile.Text = File.ReadAllText(Server.MapPath(fuUploadFile.FileName))

 End If

End Sub

C#.Net

protected void cmdShowContents_Click(object sender, System.EventArgs e) {

    ViewState("fileName") = fuUploadFile.FileName;

    if ((fuUploadFile.PostedFile != null)) {

        fuUploadFile.PostedFile.SaveAs("C:\\Inetpub\\wwwroot\\ReadAllTextPro\\" + fuUploadFile.FileName);

        txtDisplayFile.Text = File.ReadAllText(Server.MapPath  (fuUploadFile.FileName));

}

}

Notice that I have used the ViewState. The reason is I need to maintain the value of read file at multiple post backs. Notice one more thing here I have used the ‘ReadAllText’ method that returns the file in form of string. You can perform the similar task by using the StreamReader. But this will not read file from server it reads from buffer. To read file from server you always need to save the file in ‘wwwroot’ and then access. Remember one thing, to work with File Class you need to import the System.IO namespace. Now add the code in cmdViewFilePro event: 

 

VB.Net

 

Protected Sub cmdViewFilePro_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles cmdViewFilePro.Click

 

 Dim fn As String = ViewState("fileName")

 Dim FilePro As New System.IO.FileInfo(Server.MapPath(fn))

 Dim nString As New StringBuilder

 

 nString.Append("FileName : " & FilePro.FullName)

 nString.Append("Size : " & FilePro.Length)

 nString.Append("Created : " & FilePro.CreationTime)

 nString.Append("Modified : " & FilePro.LastWriteTime)

 nString.Append("Access : " & FilePro.LastAccessTime)

 nString.Append("Attribute : " & FilePro.Attributes)

 nString.Append("ReadOnly : " & FilePro.IsReadOnly)

 nString.Append("FileName : " & FilePro.Extension)

 lblShowPro.Visible = True

 lblShowPro.Text = nString.ToString

End Sub

 

C#.Net

  1. protected void cmdViewFilePro_Click(object sender, System.EventArgs e)
  2. {
  3. string fn = ViewState("fileName");
  4.    
  5.     System.IO.FileInfo FilePro = new System.IO.FileInfo(Server.MapPath(fn));
  6.      StringBuilder nString = new StringBuilder();
  7.      nString.Append("FileName : " + FilePro.FullName);
  8.      nString.Append("Size : " + FilePro.Length);
  9.      nString.Append("Created : " + FilePro.CreationTime);
  10.      nString.Append("Modified : " + FilePro.LastWriteTime);
  11.      nString.Append("Access : " + FilePro.LastAccessTime);
  12.      nString.Append("Attribute : " + FilePro.Attributes);
  13.      nString.Append("ReadOnly : " + FilePro.IsReadOnly);
  14.      nString.Append("FileName : " + FilePro.Extension);
  15.      lblShowPro.Visible = true;
  16.      lblShowPro.Text = nString.ToString;
  17.  }

 

Here I have accessed the file name from the ViewState and then Map its path and finally get the file attributes and display on my browser

 

This is a simple article .i hope u will like and enjoying this Article. If you feel any difficulty then reference the source code.because Source code is given with this Article for your proper understanding.

 

   
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