some ways

1 you can by querystring

response.redirect("page2.aspx?Uid=" + textbox1.text);

2. if is FW2 you can by PostBackUrl

<asp:Button ID="Button2" runat="server" PostBackUrl="~/searchForum/searchResult.aspx"
Text="search" />

and to get the value from the other page:
Response.Write(Page.PreviousPage.FindControl("titleBody").ToString());

3. by session.