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I have one webpage that contains two dropdownlists and few other controls.
when i select value in one dropdownlist then other dropdownlist will be binding from database based on first dropdownlist selected value.so,when i selecting dropdownlist total page is postbacking so,how to prevent that total page postback.
Posted

You can put your code in ajax update panel.

C#
<asp:UpdatePanel ID="UpdatePanel2" runat="server">
   <ContentTemplate>
      //your html
   </ContentTemplate> 
</asp:UpdatePanel>
   
v2
Either use Ajax update panel or bind the dropdown list using Classic ajax method.
   
place all the dropdownlist which are firing a post back event in updatepanel's content tempalte field control of ajax.
for example refer
C#
<asp:scriptmanager enablepartialrendering="true" xmlns:asp="#unknown">
 ID="ScriptManager1" runat="server"></asp:scriptmanager>
 <div>
 <asp:updatepanel id="UpdatePanel1" runat="server" xmlns:asp="#unknown">
 UpdateMode="Conditional"> <contenttemplate>
  <asp:dropdownlist id="NetworkCodeDropDown" autopostback="true" onselectedindexchanged="DropDown_Changed" runat="server"> </asp:dropdownlist>
  </contenttemplate>
  </asp:updatepanel>
   
v2

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