ajaxToolkit:AutoCompleteExtender 效率问题

各位好，我现在在开发项目的时候，在gridview中用到了多个ajaxToolkit:AutoCompleteExtender控件，但是使用之后，计算合计值等操作会变得很卡，用HttpWatch追踪后发现好像每次计算合计值都会触发的回发,但是我还有使用UpdatePanel控件，代码如下，不知道各位有没有提高效率的方法
  <asp:GridView ID="gvList" runat="server" AutoGenerateColumns="False" Width="98%" >
  <Columns>
  <asp:TemplateField HeaderText="品名">
  <HeaderTemplate>
  <asp:LinkButton ID="LinkButton2" Style="color: White;" OnClientClick="GetItem();return false;"
  runat="server">品名</asp:LinkButton>
  </HeaderTemplate>
  <ItemTemplate>
  <asp:HiddenField ID="hidomaterialname" runat="server" Value='<%#Bind("MaterialName") %>' />
  <asp:TextBox ID="txtmaterialname" runat="server" Text='<%#Bind("MaterialName") %>'
  AutoPostBack="true" OnTextChanged="txtmaterialname_TextChanged" Width="140px"></asp:TextBox>
  <%-- <ajaxToolkit:AutoCompleteExtender runat="server" ID="autoComplete3" TargetControlID="txtmaterialname"
  ServicePath="AutoCatchInformation.asmx" ServiceMethod="GetCompletionListItemName"
  MinimumPrefixLength="1" CompletionInterval="1000" EnableCaching="true" CompletionSetCount="10"
  DelimiterCharacters=";, :">
  </ajaxToolkit:AutoCompleteExtender>--%>
  </ItemTemplate>
  <FooterTemplate>
  <br />
  &nbsp;
  </FooterTemplate>
  <FooterStyle Width="100px" HorizontalAlign="Center" />
  <HeaderStyle HorizontalAlign="Center" />
  </asp:TemplateField>
  <asp:TemplateField HeaderText="订单数量">
  <ItemTemplate>
  <asp:TextBox Width="40px" ID="txtOrderQty" OnTextChanged="txtunit_price_TextChanged"
  AutoPostBack="true" onfocus=" return setnull1(this); " onkeypress="if(!this.value.match(/^[\+\-]?\d*?\.?\d*?$/))this.value=this.t_value;else this.t_value=this.value;if(this.value.match(/^(?:[\+\-]?\d+(?:\.\d+)?)?$/))this.o_value=this.value"
  onkeyup="if(!this.value.match(/^[\+\-]?\d*?\.?\d*?$/))this.value=this.t_value;else this.t_value=this.value;if(this.value.match(/^(?:[\+\-]?\d+(?:\.\d+)?)?$/))this.o_value=this.value"
  onblur="if(!this.value.match(/^(?:[\+\-]?\d+(?:\.\d+)?|\.\d*?)?$/))this.value=this.o_value;else{if(this.value.match(/^\.\d+$/))this.value=&#13;&#10;0+this.value;if(this.value.match(/^\.$/))this.value=0;this.o_value=this.value};"
  runat="server" Text='<%# Bind("OrderQty","{0:F0}") %>'></asp:TextBox>
  </ItemTemplate>
  <ItemStyle Width="40px" />
  <FooterTemplate>
  <br />
  &nbsp;<asp:Label ID="lbOrderQtyTotal" Width="40px" runat="server" Text=""></asp:Label></td>
  </FooterTemplate>
  <FooterStyle Width="40px" HorizontalAlign="Right" />
  <HeaderStyle HorizontalAlign="Center" />
  </asp:TemplateField>
 </Columns>
  </asp:GridView>

顶一下