How to upload and download files using asp net and c# Part 139

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In this video, we will discuss
1. Uploading files
2. Displaying the list of files that are already uploaded
3. Downloading files

When the files are uploaded, they should be uploaded to a folder on the web server. In our case, we will be uploading to "Data" folder.

[div style="font-family:Arial"]
[asp:FileUpload ID="FileUpload1" runat="server" /]
[asp:Button ID="Button1" runat="server" Text="Upload"
OnClick="Button1_Click" /]
[br /]
[br /]
[asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
OnRowCommand="GridView1_RowCommand" BackColor="White"
BorderColor="#CC9966" BorderStyle="None"
BorderWidth="1px" CellPadding="4"]
[Columns]
[asp:TemplateField HeaderText="File" ShowHeader="False"]
[ItemTemplate]
[asp:LinkButton ID="LinkButton1" runat="server"
CausesValidation="False"
CommandArgument='[%# Eval("File") %]'
CommandName="Download" Text='[%# Eval("File") %]']
[/asp:LinkButton]
[/ItemTemplate]
[/asp:TemplateField]
[asp:BoundField DataField="Size" HeaderText="Size in Bytes" /]
[asp:BoundField DataField="Type" HeaderText="File Type" /]
[/Columns]
[FooterStyle BackColor="#FFFFCC" ForeColor="#330099" /]
[HeaderStyle BackColor="#990000" Font-Bold="True"
ForeColor="#FFFFCC" /]
[PagerStyle BackColor="#FFFFCC" ForeColor="#330099"
HorizontalAlign="Center" /]
[RowStyle BackColor="White" ForeColor="#330099" /]
[SelectedRowStyle BackColor="#FFCC66" Font-Bold="True"
ForeColor="#663399" /]
[SortedAscendingCellStyle BackColor="#FEFCEB" /]
[SortedAscendingHeaderStyle BackColor="#AF0101" /]
[SortedDescendingCellStyle BackColor="#F6F0C0" /]
[SortedDescendingHeaderStyle BackColor="#7E0000" /]
[/asp:GridView]
[/div]

protected void Button1_Click(object sender, EventArgs e)
{
if (FileUpload1.HasFile)
{
string fileName = FileUpload1.FileName;
FileUpload1.PostedFile
.SaveAs(Server.MapPath("~/Data/") + fileName);
}

DataTable dt = new DataTable();
dt.Columns.Add("File");
dt.Columns.Add("Size");
dt.Columns.Add("Type");

foreach (string strfile in Directory.GetFiles(Server.MapPath("~/Data")))
{
FileInfo fi = new FileInfo(strfile);
dt.Rows.Add(fi.Name, fi.Length.ToString(),
GetFileTypeByExtension(fi.Extension));
}

GridView1.DataSource = dt;
GridView1.DataBind();
}

private string GetFileTypeByExtension(string fileExtension)
{
switch (fileExtension.ToLower())
{
case ".docx":
case ".doc":
return "Microsoft Word Document";
case ".xlsx":
case ".xls":
return "Microsoft Excel Document";
case ".txt":
return "Text Document";
case ".jpg":
case ".png":
return "Image";
default:
return "Unknown";
}
}

protected void GridView1_RowCommand(object sender,
GridViewCommandEventArgs e)
{
if (e.CommandName == "Download")
{
Response.Clear();
Response.ContentType = "application/octect-stream";
Response.AppendHeader("content-disposition", "filename="
+ e.CommandArgument);
Response.TransmitFile(Server.MapPath("~/Data/")
+ e.CommandArgument);
Response.End();
}
}

Please make sure to include the following using declarations in the code behind file.
using System.IO;
using System.Data;

Make sure to replace [ with LESSTHAN and ] with GREATERTHAN symbol.

[awguitars]

Dear Venkat, I just wanted to thank you for creating and sharing such a thorough, concise and truly excellent body of work. Your ability to convey complex programming concepts in such an understandable and accessible manner is exemplary. The breadth of content you have on offer is astounding and the fact that you do all this in such perfect English (which I assume (rightly or wrongly) is not your first language) and for free is quite frankly amazing. I'm so grateful of discovering your channel and cannot thank you enough for your knowledge and generosity.

[Liev]

Saved my life...AGAIN

I JUST LOVE YOU

[durgamuthusamy]

very use full... following the steps .. saves my timee.. Thank youu ..

[rasheedmalik]

Thanks alot, the download code of just 5xlines saved my day

[vaibhavtrikolikar]

Thank You sir for another great video :)

[virajparikh]

just outstanding work !!
mindblowing venkat
i am following all your dotnet videos and it is helping me
thanku very much from all of us !!

[aishakhan]

Great.... very helpful and easy to understand video thank you so much sir

[burn]

Thank you very sir for uploading this video. This is such a great help to other programmers. The video is very easy to understand and very informative. More POWER to you!! Salute! yaHOOoo!

[sachinthorat]

Thanks a lot...its helped a lot and 100% working..

[oyilatechnology]

Hooo, thanks in millions, am sure people like me that you are blessing with your knowledge will always remember you, l no many people like me don't even known how best to thank you, But an sure God will say thanks to you.Alos people are saying storing file in database is better than saving in server so can you pls do that as well and dont forget the mater pages tutorial you promise.It is well with u and your family Thanks you sir.

[jadehawk]

Excellent video. easy to understand even for a newbie like me. The way you explain as you go is excellent!!.
Thank you for uploading this..

[rukhsarahmad]

thank u sir i just copy your grid view code and past. that work fine.. (y)
you are best sir

[yudha]

Thank you very much sir excelent tutorial

[oscaribl]

Thanks a lot your explanation is so clear, and easy to do.

[saagarsoni]

sir i was searching for this topic only....thnx a lot for sharing ....tkcr

[acklas]

Hi Venkat - I regularly watch your videos and i must say this video is so good and explained with so much clarity and in simple language ... Its surely something that people love watching when concepts are explained beautifully and you are surely doing a great job at it ... Thanks :) Keep the good videos and knowledge sharing coming always ...

[sheikhshuaib]

hi your videos are awesome, i have been watching these videos from almost a year. Sir, you are doing a great job. Now to the point, how to preview the pictures before uploading them

[dineshrana]

Firstly greetings Sir, Your videos amazing. Please make a videos on file downloading with progress bar...

[Csharp-video-tutorialsBlogspot]

Here is the syntax - + fileName). Hope this helps. Good Luck.

[sumitbopche]

very very very helpful . Thank u very much .