how to download a file from sql database

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this is my code to upload a file in sql server

XML

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="fileupload.aspx.cs" Inherits="fileupload" %>

<!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 runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:FileUpload ID="FileUpload1" runat="server" />
        <br />
<asp:Button ID="btnUpload" runat="server" Text="Upload"
OnClick="btnUpload_Click" />
<br />
<asp:Label ID="lblMessage" runat="server" Text=""
Font-Names = "Arial"></asp:Label>

        <br />
        <br />

        <asp:GridView ID="GridView1" runat="server" CellPadding="4" ForeColor="#333333"
            GridLines="None">
            <RowStyle BackColor="#E3EAEB" />

            <FooterStyle BackColor="#1C5E55" Font-Bold="True" ForeColor="White" />
            <PagerStyle BackColor="#666666" ForeColor="White" HorizontalAlign="Center" />
            <SelectedRowStyle BackColor="#C5BBAF" Font-Bold="True" ForeColor="#333333" />
            <HeaderStyle BackColor="#1C5E55" Font-Bold="True" ForeColor="White" />
            <EditRowStyle BackColor="#7C6F57" />
            <AlternatingRowStyle BackColor="White" />
        </asp:GridView>
    </div>
    </form>
</body>
</html>

code behind(.cs)

C#

using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
using System.IO;

public partial class fileupload : System.Web.UI.Page
{
    SqlConnection con = new SqlConnection("Data Source=GRAFT11;Initial Catalog=sample;Integrated Security=True;");
    
    protected void Page_Load(object sender, EventArgs e)
    {
        con.Open();
        DataSet ds = new DataSet();
        SqlDataAdapter da = new SqlDataAdapter("select * from fileupload", con);
        da.Fill(ds);
        GridView1.DataSource = ds;
        GridView1.DataBind();
        con.Close();

    }
    protected void btnUpload_Click(object sender, EventArgs e)
    {
        // Read the file and convert it to Byte Array
        string filePath = FileUpload1.PostedFile.FileName;
        string filename = Path.GetFileName(filePath);
        string ext = Path.GetExtension(filename);
        string contenttype = String.Empty;

        //Set the contenttype based on File Extension
        switch (ext)
        {
            case ".doc":
                contenttype = "application/vnd.ms-word";
                break;
            case ".docx":
                contenttype = "application/vnd.ms-word";
                break;
            case ".xls":
                contenttype = "application/vnd.ms-excel";
                break;
            case ".xlsx":
                contenttype = "application/vnd.ms-excel";
                break;
            case ".jpg":
                contenttype = "image/jpg";
                break;
            case ".png":
                contenttype = "image/png";
                break;
            case ".gif":
                contenttype = "image/gif";
                break;
            case ".pdf":
                contenttype = "application/pdf";
                break;
        }
        if (contenttype != String.Empty)
        {

            Stream fs = FileUpload1.PostedFile.InputStream;
            BinaryReader br = new BinaryReader(fs);
            Byte[] bytes = br.ReadBytes((Int32)fs.Length);

            //insert the file into database
            string strQuery = "insert into fileupload(Name, ContentType, Data)" +
               " values (@Name, @ContentType, @Data)";
            SqlCommand cmd = new SqlCommand(strQuery);
            cmd.Parameters.Add("@Name", SqlDbType.VarChar).Value = filename;
            cmd.Parameters.Add("@ContentType", SqlDbType.VarChar).Value
              = contenttype;
            cmd.Parameters.Add("@Data", SqlDbType.Binary).Value = bytes;
            InsertUpdateData(cmd);
            lblMessage.ForeColor = System.Drawing.Color.Green;
            lblMessage.Text = "File Uploaded Successfully";
        }
        else
        {
            lblMessage.ForeColor = System.Drawing.Color.Red;
            lblMessage.Text = "File format not recognised." +
              " Upload Image/Word/PDF/Excel formats";
        }

    }
    private Boolean InsertUpdateData(SqlCommand cmd)
    {
       
        cmd.CommandType = CommandType.Text;
        cmd.Connection = con;
        try
        {
            con.Open();
            cmd.ExecuteNonQuery();
            return true;
        }
        catch (Exception ex)
        {
            Response.Write(ex.Message);
            return false;
        }
        finally
        {
            con.Close();
            con.Dispose();
        }
    }
}

i want a code to download the upload file from sql database.........
please help me.......

Posted 8-Feb-12 19:11pm

saravana__

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thatraja · Answer 1 · 2012-02-08T19:51:00

Solution 1

Check this article
Upload and Download Files with SQL Server in ASP.NET[^]

Posted 8-Feb-12 19:51pm

thatraja

Comments

saravana__ 9-Feb-12 5:01am

I want the code to download the file from sql database

thatraja 9-Feb-12 5:05am

Did you look at that article? It has the solution which is easy one.

Espen Harlinn 9-Feb-12 9:14am

5'ed!