Monday, June 4, 2012

How to Store and retrieve Image in Database using C# ASP.Net JQuery


In this article, I’ll explain how to store and retrieve Image in Database using C# ASP.Net jQuery. There is many other way to do that but here is the easiest way to do it.
Database:
For this tutorial, I am using following database.
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CREATE TABLE [dbo].[tblImage](
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [image] [image] NULL,
 CONSTRAINT [PK_tblImage] PRIMARY KEY CLUSTERED
(
    [ID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO
Connection string:
Below is the connection string to connect to the database.
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<connectionStrings>
    <add name="TempConnectionString" connectionString="Data Source=ASHISH;Initial Catalog=Temp;Persist Security Info=True;User ID=sa;Password=Temp1234567" providerName="System.Data.SqlClient"/>
</connectionStrings>
Page:
In this tutorial, there one aspx page and one handler.
1. UploadImage.aspx – To Store image into database
2. DisplayImage.aspx – To display image from handler
3. DisplayImage.ashx – To read image from database (Handler)
Upload image
1. UploadImage.aspx 

Below HTML Markup of the page, you will notice that I have placed FileUpload to upload image into database.
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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="UploadImge.aspx.cs" Inherits="UploadImge" %>
<!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>Ashish Blog</title>
</head>
<body>
    <form id="form1" runat="server">
    <strong>Upload Image into database</strong><br />
    <br />
    Select
Image: <asp:FileUpload ID="FileUpload1" runat="server" /><br />
<br />
<asp:Button ID="butSubmit" runat="server" Text="Submit"
onclick="butSubmit_Click" /><br />
<asp:Label ID="lblStatus" runat="server"></asp:Label>
   <br />
    <br />
    <a href="DisplayImage.aspx">Display Image</a></form>
</body>
</html>
Codebehind:
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Configuration;
public partial class UploadImge : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    }
    protected void butSubmit_Click(object sender, EventArgs e)
    {
        try
        {
            Byte[] imgByte = null;
            if (FileUpload1.HasFile &amp;&amp; FileUpload1.PostedFile != null)
            {
                HttpPostedFile File = FileUpload1.PostedFile;
                imgByte = new Byte[File.ContentLength];
                File.InputStream.Read(imgByte, 0, File.ContentLength);
            }
            string cs = ConfigurationManager.ConnectionStrings["TempConnectionString"].ConnectionString;
           using( SqlConnection connection = new SqlConnection(cs))
           {
               connection.Open();
               string sql = "INSERT INTO tblImage(image) VALUES(@theImage) SELECT @@IDENTITY";
               using (SqlCommand cmd = new SqlCommand(sql, connection))
               {
                   cmd.Parameters.AddWithValue("@theImage", imgByte);
                   int id = Convert.ToInt32(cmd.ExecuteScalar());
                   lblStatus.Text = String.Format("Image is Uploaded successfully!! and Image ID is {0}", id);
                   cmd.Dispose();
               }
               connection.Close();
               connection.Dispose();
           }
        }
        catch(Exception ex)
        {
            lblStatus.Text = "There was an error" + ex.Message ;
        }
    }
}
2. DisplayImage.aspx 

Below HTML Markup of the page, you will notice that I have placed jQuery function to display Image from database. You may also notice that I created Img variable and call ReadImage.ashx handler by passing Image ID in scr attribute of Img then append this Img to div.display.
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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="DisplayImage.aspx.cs" Inherits="DisplayImage" %>
<!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></title>
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
    <script type="text/javascript">
        $(document).ready(function () {
            $("#Button1").click(function (e) {
                $('.display').text('');   //clean div display
                var ID = $("#txtID").val();
                if (ID.length > 0) {
                    var newImage = $('<img />');
                    newImage.attr('src', 'ReadImage.ashx?id=' + ID); // call handler with id
                    $('.display').append(newImage);
                }
                e.preventDefault();
            });
        });
    </script>
</head>
<body>
    <form id="form1" runat="server">
     Display Image<br />
    <br />
    Id
    <asp:TextBox ID="txtID" runat="server"></asp:TextBox>
&amp;nbsp;<asp:Button ID="Button1" runat="server" Text="Display" />
    <br />
    <br />
    <div class="display"></div>
    <br />
    <br />
    </form>
</body>
</html>
3. DisplayImage.ashx (Handler)
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<%@ WebHandler Language="C#" Class="ReadImage" %>
using System;
using System.Web;
using System.Data.SqlClient;
using System.IO;
using System.Configuration;
public class ReadImage : IHttpHandler
{
    public void ProcessRequest (HttpContext context) {
        Int32 theID;
        if (context.Request.QueryString["id"] != null)
            theID = Convert.ToInt32(context.Request.QueryString["id"]);
        else
            throw new ArgumentException("No parameter specified");
        context.Response.ContentType = "image/jpeg";
        Stream strm = DisplayImage(theID);
        byte[] buffer = new byte[2048];
        int byteSeq = strm.Read(buffer, 0, 2048);
        while (byteSeq > 0)
        {
            context.Response.OutputStream.Write(buffer, 0, byteSeq);
            byteSeq = strm.Read(buffer, 0, 2048);
        }
    }
    public Stream DisplayImage(int theID)
    {
        string cs = ConfigurationManager.ConnectionStrings["TempConnectionString"].ConnectionString;
           using( SqlConnection connection = new SqlConnection(cs))
           {
            string sql = "SELECT image FROM tblImage WHERE id = @ID";
            using (SqlCommand cmd = new SqlCommand(sql, connection))
            {
                cmd.CommandType = System.Data.CommandType.Text;
                cmd.Parameters.AddWithValue("@ID", theID);
                connection.Open();
                object theImg = cmd.ExecuteScalar();
                try
                {
                    return new MemoryStream((byte[])theImg);
                }
                catch
                {
                    return null;
                }
                finally
                {
                    cmd.Dispose();
                    connection.Close();
                    connection.Dispose();
                }
            }
        }
    }
    public bool IsReusable {
        get {
            return false;
        }
    }
}
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