How do I retrieve an image thumbnail in gridview

See more:

VB

ASP.NET

Gridview

I am trying to implement functionality for an image thumbnail within a gridview whereby I can view it full size in a new browser window using the example at :
http://odetocode.com/articles/172.aspx

In the last part of the article there is an instruction to pass an additional parameter in the query string so that you view the full size of the image when it opens in new browser window. How do I implement this functionality? I understand that the additional parameter should refer to source below as outlined in the article.

        <ItemTemplate >
  <a href='<%# "getImage.aspx?ThumbNail=\"N\"&ID=" + DataBinder.Eval(Container.DataItem, 
                   "ImageIdentity")  %>'>
      <img runat="server" src='<%# "getImage.aspx?ID=" + DataBinder.Eval  
       (Container.DataItem, "ImageIdentity")%>' ID="Img1"/>
  </a>
</ItemTemplate>

I want to know how i can pass the additional parameter to the snippet below in the getImage.aspx page

        System.Data.SqlClient.SqlDataReader Reader=null;
      string ImageIdentity = Request.QueryString["ID"].ToString();
      SqlConnection sqlConnection = new SqlConnection(@"initial catalog=Articles;user

id=sa;password=;server=myServer");
      sqlConnection.Open();     
      SqlCommand sqlCommand = new SqlCommand("Select Images,ImageType from Images where

imageKey="+ImageIdentity  ,sqlConnection);
      Reader= sqlCommand.ExecuteReader(CommandBehavior.CloseConnection); 
      Reader.Read();

What I have tried:

I have tried something of this order:

con = New SqlConnection(ConfigurationManager.ConnectionStrings("Constring").ConnectionString)
        If Not IsPostBack Then
            Dim docID = Request.QueryString("id")
            Dim docIDapp = Request.QueryString("idapp")
            If Request.QueryString("id") <> "" Then
                cmd = New SqlCommand("Select * from ONLINELOANS where id = '" & docID & "'", con)
                'ElseIf Request.QueryString("entity") <> "" Then
                '    cmd = New SqlCommand("Select * from PROCURING_DOCUMENTS where id = '" & docID & "'", con)
                'Else
                '    cmd = New SqlCommand("Select * from CAPITAL_DOCUMENTS where id = '" & docID & "'", con)
            End If
            If Request.QueryString("idapp") <> "" Then
                cmd = New SqlCommand("Select * from ONLINELOANS where id = '" & docID & "'", con)