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  1. POhow we can have ToolkitScriptManager & ScriptManager both in master page
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    <p>before i was using ScriptManager in the master page. and when i was running main page i had not any problem.</p> <p>now i have decided to add combo box to main page , so i should add ToolkitScriptManager to the master page.</p> <p>because of error , i removed ScriptManager of the master page but now my main page has completely post back and slow, how i can have both of them in the master page without error.</p> <pre><code> &lt;asp:UpdatePanel ID="UpdatePanel1" runat="server"&gt; &lt;ContentTemplate&gt; &lt;asp:DropDownList ID="ddlProjectDocument" runat="server" Height="16px" AppendDataBoundItems="True" Width="212px" onselectedindexchanged="ddlProjectDocument_SelectedIndexChanged" AutoPostBack="True" onload="ddlProjectDocument_Load" style="font-family: 'Courier New', Courier, monospace" &gt; &lt;asp:ListItem Selected="True" Value="0"&gt;(select a value)&lt;/asp:ListItem&gt; &lt;/asp:DropDownList&gt; &lt;br /&gt; &lt;ajaxtoolkit:ComboBox ID="ComboBox1" runat="server" onload="ComboBox1_Load" AutoCompleteMode="Suggest" style="font-family: 'Courier New', Courier, monospace" &gt; &lt;/ajaxtoolkit:ComboBox&gt; &lt;/ContentTemplate&gt; &lt;Triggers&gt; &lt;asp:PostBackTrigger ControlID="ddlProjectDocument" /&gt; &lt;/Triggers&gt; &lt;/asp:UpdatePanel&gt; </code></pre> <p>master page:</p> <pre><code> &lt;%@ Master Language="C#" AutoEventWireup="true" CodeFile="MasterAdmin.master.cs" Inherits="MasterAdmin" %&gt; &lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt; &lt;html xmlns="http://www.w3.org/1999/xhtml"&gt; &lt;head runat="server"&gt; &lt;title&gt;Untitled Page&lt;/title&gt; &lt;asp:ContentPlaceHolder id="head" runat="server"&gt; &lt;/asp:ContentPlaceHolder&gt; &lt;style type="text/css"&gt; .style1 { width: 40%; font-size:large; } &lt;/style&gt; &lt;link href="StyleSheet.css" rel="stylesheet" type="text/css" /&gt; &lt;/head&gt; &lt;body&gt; &lt;form id="form1" runat="server"&gt; &lt;ajaxtoolkit:toolkitscriptmanager ID="ToolkitScriptManager1" runat="server"&gt; &lt;/ajaxtoolkit:toolkitscriptmanager&gt; </code></pre>
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