من کد زیر را نوشتم اما بعضی موقع کار میکنه و بعضی موقع کار نمیکنه
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional" ChildrenAsTriggers="true" >
<ContentTemplate>
<asp:TreeView ID="TreeView1" runat="server" style="position: relative;top:25px"
LineImagesFolder="CSS/TreeLineImages" CssClass="TreeView"
ImageSet="Simple2" onselectednodechanged="TreeView1_SelectedNodeChanged1"
Font-Size="Larger" ontreenodeexpanded="TreeView1_TreeNodeExpanded" >
<ParentNodeStyle Font-Bold="False" />
<HoverNodeStyle CssClass="HoverTreeNode " ForeColor="White"
Font-Underline="false" />
<SelectedNodeStyle CssClass="SelectedTreeNode" Font-Underline="false"
ForeColor="White" HorizontalPadding="0px" VerticalPadding="0px"
BackColor="White" />
<NodeStyle Font-Names="Tahoma" Font-Size="10pt" ForeColor="Black"
HorizontalPadding="0px" NodeSpacing="0px" VerticalPadding="0px" />
</asp:TreeView>
<div id="contentDiv" style="position:absolute;right:180px; width:500px; min-height:900px;direction:ltr;top:60px;z-index:100">
<asp:GridView ID="GridView2" runat="server" AutoGenerateColumns="False"
PageSize="5" CellPadding="4"
DataKeyNames="id,Description" DataSourceID="SqlDataSource2" ForeColor="#333333"
GridLines="None" Width="500px" style="height:200px; margin-right: 0px;"
AllowPaging="True" BorderStyle="Solid" BorderColor="Gray"
onselectedindexchanged="GridView2_SelectedIndexChanged"
onrowcommand="GridView2_RowCommand" DataMember="DefaultView"
OnRowDataBound="GridView2_RowDataBound" Height="160px" onpageindexchanging="GridView2_PageIndexChanging">
<FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
<Columns>
<asp:BoundField DataField="Description" HeaderText="متن" HtmlEncode="False"
HtmlEncodeFormatString="False" ItemStyle-Width="300px" ItemStyle-CssClass="hideGridColumn" HeaderStyle-CssClass="hideGridColumn">
<HeaderStyle CssClass="hideGridColumn"></HeaderStyle>
<ItemStyle Width="300px" ></ItemStyle>
</asp:BoundField>
<asp:TemplateField HeaderText="لیست شغل و نرم افزار های هر گروه" SortExpression="SoftwareName" ItemStyle-Width="450px" HeaderStyle-Font-Size="Small" >
<EditItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("SoftwareName") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<table border="1" style="width: 100%; height: 100%">
<tr>
<td style="background-image: url(Images/back.gif); height: 12px">
</td>
</tr>
<tr>
<td>
<table style="width: 100%; height: 100%">
<tr>
<td rowspan="3" style="width: 92px">
<asp:Image ID="ImgSoft" runat="server" Height="77px" ImageUrl='<%# Eval("ImageName") %>'
Width="92px" /></td>
<td align="center" style="width: 30%">
<asp:Label ID="lblSoftware" runat="server" Font-Bold="True" Font-Size="Small"
Text='<%# Bind("SoftwareName") %>'></asp:Label></td>
<td style="width: 70%" align="right">
<asp:Label ID="Label2" runat="server" ForeColor="Maroon" Text=":نرم افزار" Width="80px"></asp:Label></td>
</tr>
<tr>
<td align="center" style="width: 85%">
<asp:Label ID="lblJob" runat="server" Font-Size="Small"
Text='<%# Bind("JobsTitle") %>'></asp:Label></td>
<td align="right" style="width:80px">
<asp:Label ID="Label3" runat="server" ForeColor="Maroon" Text=":نام شغل"
style="top:140px; right:0px;"></asp:Label></td>
</tr>
<tr>
<td align="right" style="width: 85%">
<table style="width: 100%; height: 100%">
<tr>
<td align="center">
<asp:Label ID="lblPrice" runat="server" Font-Size="Small"
Text='<%# Eval("SoftwarePrice") %>'></asp:Label></td>
</tr>
</table>
</td>
<td style="width: 15%" align="right">
<asp:Label ID="Label4" runat="server" ForeColor="Maroon" Text=":قیمت"></asp:Label></td>
</tr>
</table>
</td>
</tr>
</table>
</ItemTemplate>
<HeaderStyle Font-Size="Small"></HeaderStyle>
<ItemStyle Width="500px"></ItemStyle>
</asp:TemplateField>
<asp:CommandField ButtonType="Image" HeaderText="انتخاب"
SelectImageUrl="~/Images/opened.gif" ShowSelectButton="True"
ItemStyle-Width="30px"
Visible="False" >
<HeaderStyle CssClass="hideGridColumn"></HeaderStyle>
<ItemStyle Width="30px" HorizontalAlign="Right"></ItemStyle>
</asp:CommandField>
<asp:BoundField DataField="id" HeaderText="کد کالا"
HeaderStyle-CssClass="hideGridColumn" ItemStyle-CssClass="hideGridColumn">
<HeaderStyle CssClass="hideGridColumn"></HeaderStyle>
</asp:BoundField>
</Columns>
<EditRowStyle BackColor="#999999" />
<SelectedRowStyle Font-Bold="True" ForeColor="#333333" BackColor="#E2DED6" />
<PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
<HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
<AlternatingRowStyle BackColor="White" ForeColor="#284775" />
<RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource2" runat="server"
ConnectionString="<%$ ConnectionStrings:JobsSoftwareSite %>"
SelectCommand="SELECT * FROM [Softwares] WHERE ([GroupId] = @GroupId) ORDER BY [SoftwareName]">
<SelectParameters>
<asp:ControlParameter ControlID="TreeView1" Name="GroupName"
PropertyName="SelectedValue" Type="String" />
</SelectParameters>
</asp:SqlDataSource>
</div>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="GridView2" />
</Triggers>
</asp:UpdatePanel>