How to convert byte images to images and how can I display in datagridview

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1.00/5 (1 vote)

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private void textBox1_TextChanged(object sender, EventArgs e)
       {


           try
           {
               cnn.Open();

               cmd.CommandText = "select * from Slab  where s_flatno=" + textBox1.Text;

               SqlDataReader dr1;
               dr1 = cmd.ExecuteReader();

               while (dr1.Read())
               {

                       dataGridView1.Rows.Add(dr1[1].ToString(), dr1[4].ToString(), dr1[5].ToString(), dr1[6].ToString(),dr1[7].ToString());
                       count = Convert.ToInt32(dataGridView1.Rows.Count.ToString());
                  }

               lblcount.Text = count.ToString();
               dr1.Close();
               cnn.Close();

           }
           catch (Exception ex)
           {
               MessageBox.Show(ex.ToString());
           }



       }

What I have tried:

in the above code im accessing database data to grid view ,but im not getting images in that. instead of geting image in getting byte string of the image ....

in the position on dr1[7].tostring() i want images instead of image byte code...

Posted 12-Feb-18 21:38pm

preetham acharya

Updated 12-Feb-18 22:03pm

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Comments

Animesh Datta 13-Feb-18 6:24am

have you taken DataGridViewImageColumn in your datagrdiview control

Richard Deeming 13-Feb-18 10:10am

Your code is vulnerable to SQL Injection[^]. NEVER use string concatenation to build a SQL query. ALWAYS use a parameterized query.

Everything you wanted to know about SQL injection (but were afraid to ask) | Troy Hunt[^]
How can I explain SQL injection without technical jargon? | Information Security Stack Exchange[^]
Query Parameterization Cheat Sheet | OWASP[^]

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RDBurmon · Answer 1 · 2018-02-12T22:03:00

You can not simply bind binary image to a control. You have to create an HttpHandler(.ashx) that process the image.

using System;
using System.Web;

public class ImageHandler : IHttpHandler, IReadOnlySessionState
{

    public void ProcessRequest(HttpContext context)
    {
        context.Response.BinaryWrite(yourImageByte);// You must replace "yourImageByte" with image reader logic from database.
    }

    public bool IsReusable {
        get { return false; }
    }

}

Finally you can bind the image to the handler.

Image1.ImageUrl ="ImageHanderl.ashx"

read this - ASP.NET Futures - Generating Dynamic Images with HttpHandlers gets Easier - Scott Hanselman