unable to retrieve image from db to show in gridview using asp.net

Question

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ASP.NET

<%@ 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  runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1"  runat="server">
    <div>
    <center>
    <table>
    <tr>
    <td>
    Image Name
    </td>
    <td>
        <asp:TextBox ID="txtImageName" runat="server">
    </td>
    </tr>
    <tr>
    <td>
    Upload IMage
    </td>
    <td>
        <asp:FileUpload ID="fileuploadimage" runat="server" />
    </td>
    </tr>
    <tr>
    <td>
        <asp:Button ID="btnUpload" runat="server" Text="Upload" 
            onclick="btnUpload_Click"  />
    </td>
    </tr>
    </table>
    
    </center>
    
    </div>
    <div>
        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False">
            <columns>
                <asp:BoundField DataField="imagename" HeaderText="Image Name" />
                
                <asp:TemplateField HeaderText="Image">
                <itemtemplate>
                    <asp:Image ID="Image1" runat="server" ImageUrl ='<%#"ImageHandler.ashx?ImID="+Eval("ImageID") %>' height="150px" Width="150px"/>
                </itemtemplate>
                
            </columns>
        
    
    
    </div>
    </form>
</body>
</html>

CS CODE:

C#

string strcon = ConfigurationManager.ConnectionStrings["dbconnection"].ConnectionString;
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            BindGridData();
        }
    }
    protected void btnUpload_Click(object sender, EventArgs e)
    {
        if (fileuploadimage.HasFile)
        {
            int length = fileuploadimage.PostedFile.ContentLength;
            byte[] imgbyte = new byte[length];
            HttpPostedFile img = fileuploadimage.PostedFile;
            img.InputStream.Read(imgbyte, 0, length);
            string imagename = txtImageName.Text;

            SqlConnection con = new SqlConnection(strcon);
            con.Open();
            SqlCommand cmd = new SqlCommand("insert into Image(ImageName,Image)values(@imagename,@imagedata)", con);
            cmd.Parameters.Add("@imagename", SqlDbType.VarChar, 50).Value = imagename;
            cmd.Parameters.Add("@imagedata", SqlDbType.Image).Value = imgbyte;
            int count = cmd.ExecuteNonQuery();
            con.Close();
            if (count == 1)
            {
                BindGridData();
                txtImageName.Text = string.Empty;
                ScriptManager.RegisterStartupScript(this, this.GetType(), "script", "alert('Added Successfully')", true);

            }
        }
    }
    public void BindGridData()
    {
        SqlConnection connection = new SqlConnection(strcon);
        SqlCommand command = new SqlCommand("select imagename,imageID from[Image]",connection);
        SqlDataAdapter daimage = new SqlDataAdapter(command);
        DataTable dt = new DataTable();
        daimage.Fill(dt);
        GridView1.DataSource = dt;
        GridView1.DataBind();
        GridView1.Attributes.Add("bordercolor", "black");
    }
}

ASHX CODE:

HTML

%@ WebHandler Language="C#" Class="ImageHandler" %>

using System;
using System.Web;
using System.Configuration;
using System.Data.SqlClient;

public class ImageHandler : IHttpHandler 
{
    string strcon = ConfigurationManager.AppSettings["ConnectionString"].ToString();
    public void ProcessRequest (HttpContext context)
    {
        string imageid = context.Request.QueryString["ImID"];
        SqlConnection connection = new SqlConnection(strcon);
        connection.Open();
        SqlCommand command = new SqlCommand("select Image from Image where ImageID=" + imageid, connection);
        SqlDataReader dr = command.ExecuteReader();
        dr.Read();
        context.Response.BinaryWrite((Byte[])dr[0]);
        connection.Close();
        context.Response.End();
     }
 
    public bool IsReusable {
        get {
            return false;
        }
    }

}

Posted 25-Jun-13 1:56am

nelson edberc

Updated 25-Jun-13 2:16am

Prasad_Kulkarni

v3

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Comments

Pallavi Waikar 25-Jun-13 8:53am

Your <asp:GridView is missing closing tag check it

nelson edberc 25-Jun-13 8:57am

Still it's not working

Pallavi Waikar 25-Jun-13 9:03am

Your referring this article compare with it http://www.aspdotnet-suresh.com/2011/01/how-to-insert-images-into-database-and.html

nelson edberc 25-Jun-13 9:27am

yes,i want to include this in my form.but it doesn't work.......

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 25-Jun-13 9:48am

Debug and find out what is happening inside the Handler.

1 solution

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Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Answer 1 · 2013-06-25T04:01:00

Problem, which I can see

1. In the below line, you are giving the ImageUrl as the "ImageID" from the BindingSource.

XML

<asp:Image ID="Image1" runat="server" ImageUrl ='<%#"ImageHandler.ashx?ImID="+Eval("ImageID") %>' height="150px" Width="150px"/>

But while binding you are reading "imageID".

C#

SqlCommand command = new SqlCommand("select imagename, imageID from[Image]",connection);

The names are different. So, I suspect the IDs are not getting added to the ImageUrl correctly.

But you need to debug and see whether the ID is getting added to the rows and the same ID is going to the Handler or not.

2. There is a space needed after "from" and before "[Image]" in the below query.

C#

SqlCommand command = new SqlCommand("select imagename, imageID from [Image]",connection);