How to display datatype 'image' in datalist dynamically

<asp:DataList ID="Datalist1" runat="server" DataKeyField="item_code" RepeatDirection="Horizontal"
RepeatLayout="Table">
<HeaderTemplate>
</HeaderTemplate>
<itemtemplate>
Item code:
<asp:Label Id="Itmcodelbl" runat="server" Text='<%#Eval("item_code") %>'>



Item Name:
<asp:Label Id="Itmnamelbl" runat="server" Text='<%#Eval("item_name") %>'>



Particulars:


<asp:TextBox Id="TB1" runat="server" Text='<%#Eval("item_desc") %>'
Height="94" ReadOnly="true" TextMode="MultiLine" BorderStyle="None">



<asp:Image ID="img" runat="server"
ImageUrl='<%#"~/Picture_file.aspx?Id="+Eval("item_code") %>'
style="border:1px solid gray;" Height="136px" Width="158px" />

List<string> adds7 = new List<string>(); //
       SqlDataAdapter da7 = new SqlDataAdapter("SELECT item_code,item_name,item_desc,picture_file FROM item", con);
       SqlCommandBuilder cb7 = new SqlCommandBuilder(da7);
       DataSet ds7 = new DataSet("member");
       da7.Fill(ds7, "member");
       for
           (
           int i = 0; i < ds7.Tables[0].Rows.Count; i++)
       {
           adds7.Add(ds7.Tables[0].Rows[i].ItemArray[0].ToString());
       }
       Datalist1.DataSource = ds7.Tables[0];
       Datalist1.DataBind();
       Datalist1.Visible = true;