C# – Full postback triggered by LinkButton inside GridView inside UpdatePanel

asp.netasp.net-ajaxcgridviewupdatepanel

I have a GridView inside of a UpdatePanel. In a template field is a button I use for marking items. Functionally, this works fine, but the button always triggers a full page postback instead of a partial postback. How do I get the button to trigger a partial postback?

<asp:ScriptManager ID="ContentScriptManager" runat="server" />
<asp:UpdatePanel ID="ContentUpdatePanel" runat="server" ChildrenAsTriggers="true">
    <ContentTemplate>
        <asp:GridView ID="OrderGrid" runat="server" AllowPaging="false" AllowSorting="false"
            AutoGenerateColumns="false">
            <Columns>
                <asp:TemplateField HeaderText="">
                    <ItemTemplate>
                        <asp:LinkButton ID="MarkAsCompleteButton" runat="server" Text="MarkAsComplete"
                            CommandName="MarkAsComplete" CommandArgument='<%# Eval("Id") %>' />
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:BoundField DataField="Name" HeaderText="Name" />
                <asp:BoundField DataField="LoadDate" HeaderText="Load Date" />
                <asp:BoundField DataField="EmployeeCutOffDate" HeaderText="Cut Off Date" />
                <asp:BoundField DataField="IsComplete" HeaderText="Is Completed" />
            </Columns>
        </asp:GridView>
    </ContentTemplate>
</asp:UpdatePanel>

Best Answer

You need to register each and every LinkButton as an AsyncPostBackTrigger. After each row is bound in your GridView, you'll need to search for the LinkButton and register it through code-behind as follows:

protected void OrderGrid_RowDataBound(object sender, GridViewRowEventArgs e)  
{  
   LinkButton lb = e.Row.FindControl("MarkAsCompleteButton") as LinkButton;  
   ScriptManager.GetCurrent(this).RegisterAsyncPostBackControl(lb);  
}

This also requires that ClientIDMode="AutoID" be set for the LinkButton, as mentioned here (thanks to Răzvan Panda for pointing this out).

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