ASP.NET 编译错误（无法调用 CodeBehind 文件中的方法）

Question

My asp.net Web Form page keeps on crashing when I add (OnPageIndexChanging="OnPageIndexChanging" PageSize="10") to my gridview. The grid view is as follows:

<asp:GridView ID="netEventGridView" runat="server" AutoGenerateColumns="false" AllowPaging="true" OnPageIndexChanging="OnPageIndexChanging" PageSize="10">

But when the page loads I get the error:

Server Error in '/' Application.

Compilation Error

Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: CS1061: 'startpage_aspx' does not contain a definition for 'OnPageIndexChanging' and no extension method 'OnPageIndexChanging' accepting a first argument of type 'startpage_aspx' could be found (are you missing a using directive or an assembly reference?)

The error does not appear if I remove OnPageIndexChanging and PageSize. The code in the codeBehind file is as follows:

protected void OnPagingIndexChanging(object sender, GridViewPageEventArgs e)
    {
        netEventGridView.PageIndex = e.NewPageIndex;
        this.BindGrid();
    }

The error also occurred when I would click the following button identified by this html code:

<asp:Button Text="Create New NetEvent" runat="server" ID="testBtn" OnClick="testBtn_Click"/>

I get this error when clicking the button:

Server Error in '/' Application.

Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.

See http://go.microsoft.com/fwlink/?LinkID=314055 for more information.

In both cases I set breakpoints in my codeBehind file and it was never reached. It seems like there is a problem when any method in the codebehind file is called and I am not sure why.

Answer 1

I see the event handler name is different in your aspx and code behind. Can you change it and try again? Change it to :

<asp:GridView ID="netEventGridView" runat="server" AutoGenerateColumns="false" AllowPaging="true" 
OnPageIndexChanging="OnPagingIndexChanging" PageSize="10">