Hi I'm trying to make a file upload function for pictures.
So can anyone please help me to make a simple file upload function in c#?

I've tried to make one, but it won't seem to work, so I've decided to start over, just with a simple file upload funktion.

Hope someone can help?

use the asp.net fileupload control and a button for starting the upload:

<asp:FileUpload ID="fileToBeUploaded" runat="server" />
<asp:Button ID="btnUpload" Text="Upload" runat="server" />

in the button click event put the following:

string fn = System.IO.Path.GetFileName(fileToBeUploaded.Posted File.FileName);

fileToBeUploaded.SaveAs(Server.MapPath(folderLocat ion) + fn);

Hope this helps.

sorry forgot to mention, by default there is a 4mb limit. If you want to allow for greater file sizes you will need to increase the MaxRequestLength in the web.config file. Just google it and there will be instructions.

Ok thx, that works fine if the user uploads a file,
But I also wan't it to work if the user dousn't upload a file.

Then the text that the person writes should just be put into the database.

My code looks like this:

aspx page:

<%@ Page Title="" Language="C#" MasterPageFile="~/admin/MasterPage.master" AutoEventWireup="true" CodeFile="skriv_beskrivelse_tekniker.aspx.cs" Inherits="admin_skriv_beskrivelse_tekniker" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">

Titel:<br /><textarea id="titel" cols="35" runat="server" rows="7"></textarea><br /><br />

indsæt billede:<br /><asp:FileUpload ID="fu" runat="server"/><br />

<asp:Button ID="opret" runat="server" Text="opret beskrivelse" OnClick="opret_Click"/>

<asp:Label ID="lblOutput" runat="server"></asp:Label><br />

</asp:Content>

cs page:

protected void opret_Click(object sender, EventArgs e)
    {

        SqlCommand objcmd = new SqlCommand();
        objcmd.CommandType = CommandType.Text;
        objcmd.Connection = objconn;
        objcmd.CommandText = "UPDATE TEKNIKKERE SET beskrivelse = @beskrivelse, img_url = @img_url WHERE id = @id";
        objcmd.Parameters.AddWithValue("@beskrivelse", (titel.Value.Replace(Environment.NewLine, "<br />")));
        objcmd.Parameters.AddWithValue("@img_url", fu.FileName);
        objcmd.Parameters.AddWithValue("id", Request.QueryString["id"]);
         


        objconn.Open();

        objcmd.ExecuteNonQuery();

        objconn.Close();


        string fn = System.IO.Path.GetFileName(fu.PostedFile.FileName);

        fu.SaveAs(Server.MapPath("../admin/images/") + fn);




            
            }

            


            }

now if the user only types text in the textbox an error page comes up with this error:

Could not find a part of the path 'D:\hshome\kischi2\radio.web.surftown.dk\admin\ima ges\'.


Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.IO.DirectoryNotFoundException: Could not find a part of the path 'D:\hshome\kischi2\radio.web.surftown.dk\admin\ima ges\'.

Source Error:

Line 47: string fn = System.IO.Path.GetFileName(fu.PostedFile.FileName) ;
Line 48:
Line 49: fu.SaveAs(Server.MapPath("../admin/images/") + fn);
Line 50:
Line 51:
I assume it is because it is looking for a file to put into the folder "images" but there is no file.
But I am not sure.

I hope you understand what I mean and can help me?

Thanks

do a check to make sure fn is not an empty string. If it's not empty then you can save the file.

Ok, but how do I do that, I don't really know how to check if the string fn is empty.

I thought maybe could do something like this, please correct me if im wrong:

if (fu.HasFile)
        {

            string fn = System.IO.Path.GetFileName(fu.PostedFile.FileName);

            fu.SaveAs(Server.MapPath("../admin/images/") + fn);

        }
        else
        {
                //don't, but I don't know how I can write it here in c# code
        }

Thx

Something like this should do.

string fn = System.IO.Path.GetFileName(fu.PostedFile.FileName) ;

if (fn != string.Empty)
{
fu.SaveAs(Server.MapPath("../admin/images/") + fn);
}