how to retrieve image from sql server database

the problem is the image is not display

this is my code
Imports System.Data.SqlClient
Imports System.IO
Imports System.Drawing.Image
Imports System.Data
Imports System.Web.UI.WebControls.Image
Imports System.Web
Imports System.Web.UI
Public Class _Default
Inherits System.Web.UI.Page
Public sqlcon As SqlConnection = New SqlConnection("server=.; database=batool; Trusted_Connection=yes;")
Public sqlcmd As SqlCommand
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button1.Click

Try
Dim picname As String
sqlcon.Open()
sqlcmd = New SqlCommand("select photo from qq", sqlcon)
Dim reader As SqlDataReader = sqlcmd.ExecuteReader
If reader.Read Then
picname = reader("photo")
Image1.ImageUrl = (picname)

End If
sqlcon.Close()
Catch ex As Exception
MsgBox(ex.Message)
End Try
End Sub
End Class


<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">

<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
<asp:Button ID="Button1" runat="server" Height="50px" Text="Button"
Width="154px" />
<asp:Image ID="Image1" runat="server" imageurl="" Height ="100" Width="100" />