post back to the same page not working asp.net - asp.net

Question

in my user.aspx page of any particular users account shows all other user names/images as link inside a datalist alongwith the particular users information who is logged in. now i want that if i click any of the other user links the users information should come on the same user.aspx page. i use this code on page load
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
If Session("UserName") Is Nothing Then
Response.Redirect("login.aspx")
Else
If Not (IsPostBack) Then
binddata()
binddata1()
binddata2()
End If
End If
End Sub
Sub binddata()
Dim mycommand As New SqlCommand("SELECT * FROM details where id = #id", con)
mycommand.Parameters.Add("#id", SqlDbType.Int)
mycommand.Parameters("#id").Value = Convert.ToInt32(Request.QueryString("id"))
con.Open()
Data.DataSource = mycommand.ExecuteReader
Data.DataBind()
con.Close()
End Sub
Sub binddata1()
Dim mycommand As New SqlCommand("SELECT * FROM details where id = #id", con)
mycommand.Parameters.Add("#id", SqlDbType.Int)
mycommand.Parameters("#id").Value = Convert.ToInt32(Request.QueryString("id"))
con.Open()
nameimage.DataSource = mycommand.ExecuteReader
nameimage.DataBind()
con.Close()
End Sub
Sub binddata2()
Dim mycommand As New SqlCommand("SELECT * FROM details ", con)
con.Open()
user.DataSource = mycommand.ExecuteReader
user.DataBind()
con.Close()
End Sub
and this script for datalist
<asp:DataList ID="custom" runat="server" DataKeyField="Name" RepeatColumns="1" >
<ItemTemplate>
<div><table>
<tr><asp:ImageButton ID="ImageButton1" runat="server" ImageUrl='<%# GetImageURL(Eval("Pic")) %>' PostBackUrl='<%# Eval("id", "user.aspx?id={0}") %>'/></tr>
<tr><td align="left" valign="top" style="width:90px"><asp:LinkButton ID="name" runat="server" ForeColor="Blue" Text='<%#Container.DataItem("Name")%>'></asp:LinkButton></td></tr>
</table></div></ItemTemplate>
</asp:DataList>
this code is working fine for first check/click. when i click one of the users it load the details of the user . but after that when i click another user it doesnot load the details of that user. i want to show : a user logged in , then there on his page there are list of other users with images. when i click any of them the details of the particular should be load in proper places. help me with this

Answer 1

You are checking for a first page load before perform data binding. Remove this check or check for control name that fire postback before it.

Answer 2

Yuriy's answer should work but another approach is to use CommandArgument instead of PostBackUrl. You will need to setup an event handler for your DataList ItemCommand. The CommandArgument value will be your ID value. Your event handler will take that ID and bind it to your data display.