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File Upload and Download in ASP.NET

Prasanta_Prince

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3.31/5 (21 votes)

5 May 2011CPOL

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ASP.NET sample code for uploading and downloading files

There are lots of situation, Where we have to use file uploader in our project. But beginners don’t get proper code for Uploading and Downloading File. Using this code they can do it:

File Upload Code

C#

string FilePath = "";
string[] a = new string[1];
string fileName = "";
string FullName = "";

if (FileUploader.FileName.Length > 0)
{
     a = FileUploader.FileName.Split('.');
     fileName = Convert.ToString(System.DateTime.Now.Ticks) + "." + a.GetValue(1).ToString();
     FilePath = Server.MapPath(@"~\SavedFolder");
     Fup1.SaveAs(FilePath + @"\" + fileName);

     FullName = FilePath + @"\" + fileName;
     // Database Saved Code
}

File Download Code

C#

string filename = "filename from Database";
Response.ContentType = "application/octet-stream";
Response.AppendHeader("Content-Disposition", "attachment;filename=" + filename);
string aaa = Server.MapPath("~/SavedFolder/" + filename);
Response.TransmitFile(Server.MapPath("~/SavedFolder/" + filename));
Response.End();

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Written By

Prasanta_Prince

Software Developer India

India

http://devcorners.com/
Total DotNet/Programming Solution

I am Prasanta Banerjee. I am an Asp.Net Developer. My site: http://devcorners.com/
Email: prasanta.it@hotmail.com
If any body wants to prepare for interview http://guru-code.blogspot.com/ is the good site.

Comments and Discussions

my file upload code is like this:
********************************
protected void btn_submit_Click(object sender, EventArgs e)
{

SqlCommand cmd3 = new SqlCommand();
if (con.State == ConnectionState.Closed)
{
con.Open();
}
cmd3.Connection = con;
cmd3.CommandType = CommandType.StoredProcedure;
cmd3.CommandText = "sp_www_ca";
cmd3.Parameters.AddWithValue("@refno", rid);
cmd3.Parameters.AddWithValue("@ca_refno", hdn_ca_refno.Value);
cmd3.Parameters.AddWithValue("@editca", txt_edit_ca.Text);

if (fileUpload1.PostedFile.ContentLength > 0 && fileUpload1.PostedFile.FileName != null)
{
string filename = Path.GetFileName(fileUpload1.PostedFile.FileName);
fileUpload1.SaveAs(Server.MapPath("~/Files/" + filename));
cmd3.Parameters.AddWithValue("@Name1", filename);
cmd3.Parameters.AddWithValue("@Path1", filename);

}
else
{
cmd3.Parameters.AddWithValue("@Name1", "");
cmd3.Parameters.AddWithValue("@Path1", "");
}

cmd3.ExecuteNonQuery();
Response.Redirect("~/www/www_caedit_success.aspx?ca_refno=" + hdn_ca_refno.Value);

}
file stored in DB like this
***************************

filename1 filepath1
75-U7-A0004.doc 75-U7-A0004.doc
my file download code like this
*******************************
string doc = dr["filepath1"].ToString();

HyperLink1.NavigateUrl = doc;

protected void Page_Load(object sender, EventArgs e)
{
rid = Request.QueryString["rno"].ToString();
con.ConnectionString = ConfigurationManager.AppSettings["Connection"];
con2.ConnectionString = ConfigurationManager.AppSettings["Connection"];
if (!IsPostBack)
{
con.Open();
con2.Open();

cmd = new SqlCommand("select empname,ticketno,date,time1,asobsrin,obname,obnumber,function1,isrel1,isrel2,processdoc,processrefno,narrate,ca_edit,filepath1 from kecbliss.dbo.www_add_details where ca_refno='" + rid + "'", con);
dr = cmd.ExecuteReader();
while (dr.Read())
{
lbl_name.Text = dr["empname"].ToString();
lbl_tokenno.Text = dr["ticketno"].ToString();
lbl_date.Text = dr["date"].ToString();
lbl_time.Text = dr["time1"].ToString();
lbl_observe.Text = dr["asobsrin"].ToString();
obsrv = lbl_observe.Text;

lbl_function.Text = dr["function1"].ToString();
lbl_relate.Text = dr["isrel1"].ToString();
lbl_relate2.Text = dr["isrel2"].ToString();
lbl_procdoc.Text = dr["processdoc"].ToString();
lbl_proc_ref.Text = dr["processrefno"].ToString();
lbl_narrate.Text = dr["narrate"].ToString();
lbl_narrate_edit.Text = dr["ca_edit"].ToString();
string doc = dr["filepath1"].ToString();

HyperLink1.NavigateUrl = doc;
}
if (obsrv == "With Other")
{
SqlCommand cmd2 = new SqlCommand("select obname,obnumber from kecbliss.dbo.www_add_details where refno='" + rid + "'", con2);
SqlDataAdapter da = new SqlDataAdapter(cmd2);
da.Fill(ds);
GridView1.DataSource = ds;
GridView1.DataBind();
}

}
}

when i click view hyperlink i am getting error like this
*******
The resource cannot be found.
Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable. Please review the following URL and make sure that it is spelled correctly.

Requested URL: /bliss/www/75-U7-A0004.doc
****
off course requested URL must show like this /bliss/Files/75-U7-A0004.doc

give me solution for this

C#

---------->
//Take BulletedList1 in page design & Write Folloing in .aspx.cs For Downloading

protected void Page_Load(object sender, EventArgs e)
{

DirectoryInfo dinfo = new DirectoryInfo(Server.MapPath("."));
BulletedList1.DataSource = dinfo.GetFiles();
BulletedList1.DataBind();

}

//Write Folloing in .aspx.cs For uploading----->
protected void Button1_Click(object sender, EventArgs e)
{
if (FileUpload1.HasFile)
{
Response.Write(FileUpload1.PostedFile.ContentLength>0);
if (FileUpload1.PostedFile.ContentLength>0)
{
string p = Server.MapPath(".")+"\\"+FileUpload1.FileName;
FileUpload1.PostedFile.SaveAs(p);
Label1.Text = "successfully uploaded";
}
else Label1.Text = "upload file";

}
else Label1.Text = "select file";
}

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