Retrieve photo from Sql Server to asp.net & Vb.net - asp.net

Question

This is in vb.net
The photo never show up and I have no error....???
This is how I stock the photo on The SQl DB
Sub StartUpLoad()
Dim imgName As String = FileUpload1.FileName
Dim imgSize As Int32 = FileUpload1.PostedFile.ContentLength
Dim photo As Byte() = New Byte(imgSize) {}
Dim user As String = "kdjhkjgh"
If FileUpload1.PostedFile IsNot Nothing AndAlso FileUpload1.PostedFile.FileName IsNot "" Then
If (FileUpload1.PostedFile.ContentLength > 100240) Then
Page.ClientScript.RegisterClientScriptBlock(GetType(Page), "alert depuis le codehind", String.Format("alert('{0}')", "Fichier trop gros"), True)
Else
Dim connectionString As String = WebConfigurationManager.ConnectionStrings("BecsEtMuseauxSQL").ConnectionString
Dim con As SqlConnection = New SqlConnection(connectionString)
con.Open()
Dim cmd As New SqlCommand("dbo.addPost", con)
cmd.CommandType = CommandType.StoredProcedure
cmd.Parameters.Add("#UserName", SqlDbType.VarChar).Value = user
cmd.Parameters.Add("#titre", SqlDbType.NVarChar).Value = TextBoxTitre.Text
cmd.Parameters.Add("#description", SqlDbType.VarChar).Value = TextBoxDescrip.Text
cmd.Parameters.Add("#image", SqlDbType.Image).Value = photo
cmd.ExecuteNonQuery()
con.Close()
Page.ClientScript.RegisterClientScriptBlock(GetType(Page), "alert depuis le codehind", String.Format("alert('{0}')", "Post sauvegardé"), True)
End If
End If
End Sub
This my handler
Public Class Handler : Implements IHttpHandler
Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest
Dim connectionString As String = WebConfigurationManager.ConnectionStrings("BecsEtMuseauxSQL").ConnectionString
Dim con As SqlConnection = New SqlConnection(connectionString)
' Create SQL Command
Dim cmd As New SqlCommand()
cmd.CommandText = "Select Titre,Image from Post where ID =#IID"
cmd.CommandType = System.Data.CommandType.Text
cmd.Connection = con
Dim ImageID As New SqlParameter("#IID", Data.SqlDbType.Int)
ImageID.Value = Convert.ToInt32(context.Request.QueryString("ID"))
cmd.Parameters.Add(ImageID)
con.Open()
Dim dReader As SqlDataReader = cmd.ExecuteReader()
dReader.Read()
context.Response.BinaryWrite(DirectCast(dReader("Image"), Byte()))
dReader.Close()
con.Close()
End Sub
Public ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable
Get
Return False
End Get
End Property
End Class
This is my asp data grid
<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="Titre" HeaderText="Titre" SortExpression="Titre" />
<asp:TemplateField HeaderText="Image">
<ItemTemplate>
<asp:Image ID="Image1" runat="server"
ImageUrl='<%# Eval("ID", "Handler.ashx?ID={0}")%>'/>
</ItemTemplate>
<ControlStyle Height="200px" />
</asp:TemplateField>
<asp:ImageField DataImageUrlField="Image">
</asp:ImageField>
</Columns>
</asp:GridView>
<br />
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:BecsEtMuseauxSQL %>"
ProviderName="<%$ ConnectionStrings:BecsEtMuseauxSQL.ProviderName %>" SelectCommand="SELECT [ID], [Titre], [Image] FROM [Post]"></asp:SqlDataSource>
Do you have any idea why my photo never show up???
Thanks for helping me!!!

Answer 1

I think, you response doesn't know what type of binary data you are sending (by default it is text/html). Try to set ContentType to "image/jpeg" (exactly, there must be your image file MIME).
If you download different image types it is better to store into table Post its MIME in your addPost procedure (you may use FileUpload1.PostedFile.ContentType property for this purpose) and use it in handler.

Answer 2

you can use context.Response.ContentType property to mention file details, so that browser can serve basic needs to rendering.
context.Response.ContentType=ImageFormat.Jpeg;