Retrieve image from database in asp.net

Question

How to retrieve images from sql database in asp.net using c#.

i want to retrieve the image file from database and then display the image in a tag.

i try this code but it is not working

aspx

 <asp:Image ID="Image1" runat="server" ImageUrl="" Height="150px" Width="165px" />

code behind

 Byte[] bytes = (Byte[])ds.Tables[0].Rows[0]["image"];
 Response.Buffer = true;
 Response.Charset = "";
 Response.Cache.SetCacheability(HttpCacheability.NoCache);
 Response.ContentType = "image/jpg";
 Response.BinaryWrite(bytes);
 Response.Flush();
 Response.End();

How to give link to the ImageUrl="" of this image???

@AhmadAbbasi That is a filename not a URI. However, if you are returning the image by addressing this http://domain/Student.aspx then your ImageUrl would be this: http://domain/Student.aspx. — Davin Tryon
– Davin Tryon, Commented Feb 18, 2013 at 12:02

Community · Accepted Answer · 2017-05-23 12:17:19Z

Create a generic http handler as follows

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

public class ShowImage : IHttpHandler
{
    public void ProcessRequest(HttpContext context)
    {
       Int32 empno;
       if (context.Request.QueryString["id"] != null)
          empno = Convert.ToInt32(context.Request.QueryString["id"]);
       else
          throw new ArgumentException("No parameter specified");

       context.Response.ContentType = "image/jpeg";
       Stream strm = ShowEmpImage(empno);
       byte[] buffer = new byte[4096];
       int byteSeq = strm.Read(buffer, 0, 4096);

       while (byteSeq > 0)
       {
           context.Response.OutputStream.Write(buffer, 0, byteSeq);
           byteSeq = strm.Read(buffer, 0, 4096);
       }       
       //context.Response.BinaryWrite(buffer);
    }

    public Stream ShowEmpImage(int empno)
    {
         string conn = ConfigurationManager.ConnectionStrings["EmployeeConnString"].ConnectionString;
         SqlConnection connection = new SqlConnection(conn);
         string sql = "SELECT empimg FROM EmpDetails WHERE empid = @ID";
         SqlCommand cmd = new SqlCommand(sql,connection);
         cmd.CommandType = CommandType.Text;
         cmd.Parameters.AddWithValue("@ID", empno);
         connection.Open();
         object img = cmd.ExecuteScalar();
         try
        {
            return new MemoryStream((byte[])img);
        }
        catch
        {
            return null;
        }
        finally
       {
            connection.Close();
       }
    }

    public bool IsReusable
    {
        get
        {
             return false;
        }
    }


}

and display image as follow

 Image1.ImageUrl = "~/ShowImage.ashx?id=" + id;

There are some links below
Showing image in GridView from the database?
How to show a image in database in the image control of Asp.net?
Display image from database in ASP.net with C#
http://www.dotnetcurry.com/ShowArticle.aspx?ID=129

I'd be interested on your opinion on whether to set IsReusable to true or false and why?

Stefano Altieri · Accepted Answer · 2013-02-18 11:41:42Z

3

I don't think this is the right approach. You should not embed image into html, and this is not the right way anyway.

I suggest adding an ashx (generic handler) and use it to generate the image from query string, then ini the page use something like

<asp:Image ImageUrl='GetImage.ashx?id=12345' ... />

answered Feb 18, 2013 at 11:41

Stefano Altieri

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Comments

Abdul Khaliq · Accepted Answer · 2020-05-22 08:23:56Z

0

With SQL (Code Project)

<asp:Image ID="ImgProfilePic" runat="server"  />

    byte[] imagem = (byte[])(dr["IMG"]);
string PROFILE_PIC = Convert.ToBase64String(imagem);
ImgProfilePic.ImageUrl = String.Format("data:image/jpg;base64,{0}", PROFILE_PIC);

answered May 22, 2020 at 8:23

Abdul Khaliq

2,2894 gold badges29 silver badges32 bronze badges

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