Can any one help in c# project?

Question

5.00/5 (1 vote)

See more:

i have displayed my data in Grid view control,,and i added addition column in it for downloading particular data in that row,,,but i do not know how to download data from Grid view by click on download button which i added to grid view for each row...suppose we have one table in ms access with following fields :-
Name Photo ID
ab "~/images/ab.jpg" 1

now my question is how can i download images from Photo field via gridview column button corresspondes to particular row.

I know about downloading coding but i donot know how to implement it in Grid View
can any one tell me how to implement it in Grid View column button.

C#

string filepath = Server.MapPath("test.doc");


FileInfo file = new FileInfo(filepath);


if (file.Exists)
{

 Response.ClearContent();


 Response.AddHeader("Content-Disposition", "attachment; filename=" + file.Name);


 Response.AddHeader("Content-Length", file.Length.ToString());


 Response.ContentType = ReturnExtension(file.Extension.ToLower());


 Response.TransmitFile(file.FullName);


 Response.End();
}

Posted 18-Aug-10 19:01pm

jattboyfrompunjab

Updated 18-Aug-10 19:48pm

thatraja

v2

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

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

Al-Farooque Shubho · Accepted Answer · 2010-08-18T19:58:00

Here goes the sample implementation. I think you are kind of new to Asp.net and hence did a sample implementation that you can understand easily and develop your own implementation.

GridView in Aspx :

XML

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <div>
            <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
                Width="215px" OnRowCommand="GridView1_RowCommand"
                onrowdatabound="GridView1_RowDataBound">
                <Columns>
                    <asp:BoundField DataField="Name" HeaderText="Name" />
                    <asp:ImageField DataImageUrlField="ImageUrl" HeaderText="Image">
                    </asp:ImageField>
                    <asp:TemplateField ShowHeader="False">
                        <ItemTemplate>
                            <asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="False"
                                CommandName="Download" Text="Download"></asp:LinkButton>
                        </ItemTemplate>
                    </asp:TemplateField>
                </Columns>
            </asp:GridView>
        </div>
    </div>
    </form>
</body>
</html>

And, the CodeBehind :

C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Collections;
using System.IO;

public partial class _Default : System.Web.UI.Page
{
    public class Person
    {
        public int Id
        {
            get;
            set;
        }
        public string Name
        {
            get;
            set;
        }
        public string ImageUrl
        {
            get;
            set;
        }
        public Person(int Id, string Name, string ImageUrl)
        {
            this.Id = Id;
            this.Name = Name;
            this.ImageUrl = ImageUrl;
        }
    }
    //Binding some sample data to the GridView
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            //Populating some dummy data. In reality, you should populate these
            //from the database
            IList items = new ArrayList();

            items.Add(new Person(1, "Peter", "~/images/ab.jpg"));
            items.Add(new Person(2, "John", "~/images/cd.jpg"));
            items.Add(new Person(3, "Shubho", "~/images/ef.jpg"));

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

    protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
    {
        if (e.CommandName == "Download")
        {
            string ImageUrl = (string)e.CommandArgument;
            string physicalImagePath = Server.MapPath(ImageUrl);
            if (File.Exists(physicalImagePath))
            {
                Response.ClearContent();
                Response.AddHeader("Content-Disposition", "attachment; filename=" + Path.GetFileName(physicalImagePath));
                Response.ContentType = "image/jpg";

                Response.TransmitFile(physicalImagePath);
                Response.Flush();
            }
        }
    }

    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            LinkButton link = e.Row.FindControl("LinkButton1") as LinkButton;
            if (link != null)
            {
                link.CommandArgument = ((Person)e.Row.DataItem).ImageUrl.ToString();
            }
        }
    }
}

This example basically binds some Person data to the gridview with images (Stored inside the web application folder's /images directory). Also, it binds a command argument to the download link in GridView's RowDataBound event (See CodeBehind). When user clicks the Download link, GridView's RowCommand event gathers the Image URL from the command argument of the LinkButton, reads the image from the physical location and writes in response for download.