Display Images In GridView From DataBase C# VB.NET

 Download sample code attached 
Sample code for displaying Images in Multiple columns

In this example i am showing how to display images in GridView from DataBase in ASP.NET using C#.NET and VB.NET or showing images stored in SQL Server database in gridview,For this i've already stored images in Database.

Table schema is shown below, ID column is primary key with Identity increment,datatype of Image column is Image.

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For displaying images in gridview we need to create a Handler to read binary data from database.
Right click on solution explorer and Add new item, Pick Generic Handler and name it Handler.ashx.
Write this code in ProcessRequest method

C# code behind

01<%@ WebHandler Language="C#" Class="Handler" %>

02 

03using System;

04using System.Web;

05using System.Configuration;

06using System.Data.SqlClient;

07 

08public class Handler : IHttpHandler {

09 

10public void ProcessRequest (HttpContext context)

11{

12SqlConnection con = new SqlConnection();

13con.ConnectionString = ConfigurationManager.ConnectionStrings

14                      ["ConnectionString"].ConnectionString;

15 

16// Create SQL Command

17SqlCommand cmd = new SqlCommand();

18cmd.CommandText = "Select ImageName,Image from Images" +

19                  " where ID =@ID";

20cmd.CommandType = System.Data.CommandType.Text;

21cmd.Connection = con;

22 

23SqlParameter ImageID = new SqlParameter

24                    ("@ID", System.Data.SqlDbType.Int);

25ImageID.Value = context.Request.QueryString["ID"];

26cmd.Parameters.Add(ImageID);

27con.Open();

28SqlDataReader dReader = cmd.ExecuteReader();

29dReader.Read();

30context.Response.BinaryWrite((byte[])dReader["Image"]);

31dReader.Close();

32con.Close();

33}

VB.NET Code

01Public Class Handler

02    Implements IHttpHandler

03 

04Public Sub ProcessRequest(ByVal context As HttpContext)

05Dim con As New SqlConnection()

06con.ConnectionString = ConfigurationManager.ConnectionStrings

07                        ("ConnectionString").ConnectionString

08 

09        ' Create SQL Command

10 

11        Dim cmd As New SqlCommand()

12        cmd.CommandText = "Select ImageName,Image from Images" +

13                          " where ID =@IID"

14        cmd.CommandType = System.Data.CommandType.Text

15        cmd.Connection = con

16 

17        Dim ImageID As New SqlParameter

18                             ("@IID", System.Data.SqlDbType.Int)

19        ImageID.Value = context.Request.QueryString("ID")

20        cmd.Parameters.Add(ImageID)

21        con.Open()

22        Dim dReader As SqlDataReader = cmd.ExecuteReader()

23        dReader.Read()

24        context.Response.BinaryWrite

25                    (DirectCast(dReader("Image"), Byte()))

26        dReader.Close()

27        con.Close()

28    End Sub

29End Class

Now drag a GridView control on the aspx page and add SQLDataSource to it.


Now go to html markup of GridView and add a TemplateField and in ItemTemplate add a Image control to display Images.
Html Source of GridView should look like this

<asp:GridView ID="GridView1" runat="server" 
              AutoGenerateColumns="False" DataKeyNames="ID"
              DataSourceID="SqlDataSource1">
<Columns>
<asp:BoundField DataField="ID" HeaderText="ID" 
                InsertVisible="False" ReadOnly="True"
                               SortExpression="ID" />
<asp:BoundField DataField="ImageName" HeaderText="ImageName" 
                               SortExpression="ImageName" />
<asp:TemplateField HeaderText="Image">
<ItemTemplate>
<asp:Image ID="Image1" runat="server" 
           ImageUrl='<%# "Handler.ashx?ID=" + Eval("ID")%>'/>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" 
ConnectionString="<%$ ConnectionStrings:ConnectionString %>"
SelectCommand="SELECT [ID], [ImageName], [Image] 
              FROM [Images]"></asp:SqlDataSource>

For VB.NET there is slight change in html markup of page
change below mentioned line

ImageUrl='<%# "Handler.ashx?ID=" + Eval("ID")%>'/>

to

ImageUrl='<%# Eval("ID", "Handler.ashx?ID={0}")%>'/>

THis is how it will look

If you want to display Images in multiple columns or in more than one clumns of GridView then u need to make changes in the code as mentioned below.

1. Add a new column in database (i've named it Image2)
2. Add one mote Template Field in html source of gridview and change source as below

<asp:TemplateField HeaderText="Image">
<ItemTemplate>
<asp:Image ID="Image1" runat="server" 
ImageUrl='<%# Eval("ID", "Handler.ashx?ID={0}")+"&img=1"%>'/>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Image2">
<ItemTemplate>
<asp:Image ID="Image2" runat="server" 
ImageUrl='<%# Eval("ID", "Handler.ashx?ID={0}")+"&img=2"%>'/>
</ItemTemplate>
</asp:TemplateField>

And make these changes in code behind of handler.ashx

01//Add this line of code in handler.ashx

02int intImg = Convert.ToInt32(context.Request.QueryString["img"]);

03//Now change earlier code to this one

04SqlDataReader dReader = cmd.ExecuteReader();

05        dReader.Read();

06        if (intImg == 1)

07        {

08            context.Response.BinaryWrite((byte[])dReader["Image"]);

09        }

10        else if (intImg == 2)

11        {

12            context.Response.BinaryWrite((byte[])dReader["Image2"]);

13        }

14        dReader.Close();

15        con.Close();

Now it will look like this

hope this helps.