<form id="form1" runat="server">
          <asp:ScriptManager ID="ScriptManager1" runat="server" />
          <br />
          <asp:UpdatePanel ID="UpdatePanel3" runat="server">
              <ContentTemplate>
                  <asp:MultiView ID="MultiView3" runat="server" ActiveViewIndex="0">
                      <asp:View ID="View5" runat="server">
                          <img alt="loading" src="spinner.gif" />
                          Loading 3 ...</asp:View>
                      <asp:View ID="View6" runat="server">
                          <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox></asp:View>
                  </asp:MultiView>
                  <asp:Timer OnTick="Show3" ID="Timer3" runat="server" Interval="1">
                  </asp:Timer>
              </ContentTemplate>
          </asp:UpdatePanel>
          <br />
          <br />
          <asp:UpdatePanel ID="UpdatePanel1" runat="server">
              <ContentTemplate>
                  <asp:MultiView ID="MultiView1" runat="server" ActiveViewIndex="0">
                      <asp:View ID="View1" runat="server">
                          <img alt="loading" src="spinner.gif" />
                          Loading 1 ...</asp:View>
                      <asp:View ID="View2" runat="server">
                          <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox></asp:View>
                  </asp:MultiView>
                  <br />
                  <asp:Timer OnTick="Show1" ID="Timer1" runat="server" Interval="1">
                  </asp:Timer>
              </ContentTemplate>
          </asp:UpdatePanel>
          <br />
          <br />
          <asp:UpdatePanel ID="UpdatePanel2" runat="server">
              <ContentTemplate>
                  <asp:MultiView ID="MultiView2" runat="server" ActiveViewIndex="0">
                      <asp:View ID="View3" runat="server">
                          <img alt="loading" src="spinner.gif" />
                          Loading 2 ...</asp:View>
                      <asp:View ID="View4" runat="server">
                          <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox></asp:View>
                  </asp:MultiView>
                  <asp:Timer OnTick="Show2" ID="Timer2" runat="server" Interval="1">
                  </asp:Timer>
              </ContentTemplate>
          </asp:UpdatePanel>
           <br />
          <br />
          <br />
      </form>
 Protected Sub Show1(ByVal sender As Object, ByVal e As System.EventArgs)        System.Threading.Thread.Sleep(1000)
         TextBox1.Text = DateTime.Now.ToString
         Timer1.Enabled = False
         MultiView1.ActiveViewIndex = 1

End Sub

Protected Sub Show2(ByVal sender As Object, ByVal e As System.EventArgs)

System.Threading.Thread.Sleep(1000)
         TextBox2.Text = DateTime.Now.ToString
         Timer2.Enabled = False
         MultiView2.ActiveViewIndex = 1

End Sub

Protected Sub Show3(ByVal sender As Object, ByVal e As System.EventArgs)

System.Threading.Thread.Sleep(1000)
         TextBox3.Text = DateTime.Now.ToString
         Timer3.Enabled = False
         MultiView3.ActiveViewIndex = 1

End Sub