Friday, 18 May 2012

Upload file in asp.net

source code:

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">

    <div>
        <asp:FileUpload ID="FileUpload1" runat="server" /><br />
        <br />
        <asp:Button ID="Button1" runat="server" OnClick="Button1_Click"
         Text="Upload File" />&nbsp;<br />
        <br />
        <asp:Label ID="Label1" runat="server"></asp:Label></div>
    </form>
</body>
</html>

.cs code

 protected void Button1_Click(object sender, EventArgs e)
    {
        if (FileUpload1.HasFile)
            try
            {
                FileUpload1.SaveAs(Server.MapPath("") +"/"+"Files"+"/"+
                     FileUpload1.FileName);
                Label1.Text = "File name: " +
                     FileUpload1.PostedFile.FileName + "<br>" +
                     FileUpload1.PostedFile.ContentLength + " kb<br>" +
                     "Content type: " +
                     FileUpload1.PostedFile.ContentType;
            }
            catch (Exception ex)
            {
                Label1.Text = "ERROR: " + ex.Message.ToString();
            }
        else
        {
            Label1.Text = "You have not specified a file.";
        }
    }

Working Around File Size Limitations

You may not realize it, but there is a limit to the size of a file that can be uploaded using this technique. By default, the maximum size of a file to be uploaded to the server using the FileUpload control is around 4MB. You cannot upload anything that is larger than this limit.

In the web.config.comments file, find a node called <httpRuntime> that looks like the following:
<httpRuntime 
 executionTimeout="110" 
 maxRequestLength="4096" 
 requestLengthDiskThreshold="80" 
 useFullyQualifiedRedirectUrl="false" 
 minFreeThreads="8" 
 minLocalRequestFreeThreads="4" 
 appRequestQueueLimit="5000" 
 enableKernelOutputCache="true" 
 enableVersionHeader="true" 
 requireRootedSaveAsPath="true" 
 enable="true" 
 shutdownTimeout="90" 
 delayNotificationTimeout="5" 
 waitChangeNotification="0" 
 maxWaitChangeNotification="0" 
 enableHeaderChecking="true" 
 sendCacheControlHeader="true" 
 apartmentThreading="false" /> 

Client-Side Validation of File Types Permissible to Upload

isting 3. Using validation controls to restrict the types of files uploaded to the server 

<asp:FileUpload ID="FileUpload1" runat="server" /><br />
<br />
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" 
 Text="Upload File" />&nbsp;<br />
<br />
<asp:Label ID="Label1" runat="server"></asp:Label>
<asp:RegularExpressionValidator 
 id="RegularExpressionValidator1" runat="server" 
 ErrorMessage="Only mp3, m3u or mpeg files are allowed!" 
 ValidationExpression="^(([a-zA-Z]:)|(\\{2}\w+)\$?)(\\(\w[\w].*))
    +(.mp3|.MP3|.mpeg|.MPEG|.m3u|.M3U)$" 
 ControlToValidate="FileUpload1"></asp:RegularExpressionValidator>
<br />
<asp:RequiredFieldValidator 
 id="RequiredFieldValidator1" runat="server" 
 ErrorMessage="This is a required field!" 
 ControlToValidate="FileUpload1"></asp:RequiredFieldValidator> 

Adding Server-Side File Type Validation

protected void Button1_Click(object sender, EventArgs e)
    {

        if (FileUpload1.HasFile)
        {
            string fileExt = 
               System.IO.Path.GetExtension(FileUpload1.FileName);

            if (fileExt == ".mp3")
            {
                try
                {
                    FileUpload1.SaveAs("C:\\Uploads\\" + 
                       FileUpload1.FileName);
                    Label1.Text = "File name: " +
                        FileUpload1.PostedFile.FileName + "<br>" +
                        FileUpload1.PostedFile.ContentLength + " kb<br>" +
                        "Content type: " +
                        FileUpload1.PostedFile.ContentType;
                }
                catch (Exception ex)
                {
                    Label1.Text = "ERROR: " + ex.Message.ToString();
                }
            }
            else
            {
                Label1.Text = "Only .mp3 files allowed!";
            }
        }
        else
        {
            Label1.Text = "You have not specified a file.";
        }
    } 
 

Uploading Multiple Files at the Same Time 

 protected void Button1_Click(object sender, EventArgs e)
{
   string filepath = "C:\\Uploads";
   HttpFileCollection uploadedFiles = Request.Files;
    
   for (int i = 0; i < uploadedFiles.Count; i++)
   {    
      HttpPostedFile userPostedFile = uploadedFiles[i];
    
      try
      {    
         if (userPostedFile.ContentLength > 0 )
         {
            Label1.Text += "<u>File #" + (i+1) + 
               "</u><br>";
            Label1.Text += "File Content Type: " + 
               userPostedFile.ContentType + "<br>";
            Label1.Text += "File Size: " + 
               userPostedFile.ContentLength + "kb<br>";
            Label1.Text += "File Name: " + 
               userPostedFile.FileName + "<br>";
    
            userPostedFile.SaveAs(filepath + "\\" + 
               System.IO.Path.GetFileName(userPostedFile.FileName));
    
            Label1.Text += "Location where saved: " + 
               filepath + "\\" + 
               System.IO.Path.GetFileName(userPostedFile.FileName) + 
               "<p>";
         }    
      } 
      catch (Exception Ex)
      {    
         Label1.Text += "Error: <br>" + Ex.Message;    
      }    
   }    
}

 

 

 

 
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