In the following blog post, you will learn about asp.net Upload and download in asp.net c# and how to save image in a folder using file upload in asp.net c#. The FileUpload control was introduced in ASP.NET 2.0.

The FileUpload control allows the user to browse for and select the file to be uploaded, providing a browse button and a text box for entering the filename.

• Keep reading on JavaScript Drag and Drop File Uploader

Upload and Download files from Folder (Directory) in ASP.Net C#

The following example shows how to use an ASP.NET FileUpload control to browse files and upload them to the Web server. Let’s get started by creating a new web application using the visual studio.

To create a control, simply drop the FileUpload control from Toolbox to a Web page. The following code adds FileUpLoad control:

To support file upload, we need to add a Link Button control:

Upload

Now on this button click event handler, we need to call the SaveAs method of FileUpLoad control, which takes a full path where the file will be uploaded. Find the below full source code:-

using System;
using System.IO;

public partial class _Default : System.Web.UI.Page
{
    string filename = string.Empty;
    protected void Page_Load(object sender, EventArgs e)
    { }

    //To upload file 
    protected void OnLnkUpload_Click(object sender, EventArgs e)
    {
        filename = Path.GetFileName(fileUpload1.PostedFile.FileName);
        fileUpload1.SaveAs(Server.MapPath("Files/" + filename));
        lblFilename.Text = "Files/" + fileUpload1.FileName;
        lblMessage.Text = "File uploaded sucessfully to the folder: -" + " Files/" + fileUpload1.FileName;
    }

    // To download uplaoded file
    protected void OnLnkDownload_Click(object sender, EventArgs e)
    {
        if (lblFilename.Text != string.Empty)
        {
            if (lblFilename.Text.EndsWith(".txt"))
            {
                Response.ContentType = "application/txt";
            }
            else if (lblFilename.Text.EndsWith(".pdf"))
            {
                Response.ContentType = "application/pdf";
            }
            else if (lblFilename.Text.EndsWith(".docx"))
            {
                Response.ContentType = "application/docx";
            }
            else
            {
                Response.ContentType = "image/jpg";
            }

            string filePath = lblFilename.Text;

            Response.AddHeader("Content-Disposition", "attachment;filename=\"" + filePath + "\"");
            Response.TransmitFile(Server.MapPath(filePath));
            Response.End();
        }
    }
}

Download Source Code

Conclusion

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