Question

So I have this checkbox inside a gridview, and it is working properly for the most part. However, I am trying to implement column-sorting to the grid, and it is causing an issue with the checkbox. When I do my initial fetch from the database, it populates the checkboxes properly, but when I click on a column to sort by it, all of my checkboxes get cleared out.

It seems that this is a problem with the Databind being done by the gridview, but I’m not sure what I’m doing wrong. My research into the issue makes me feel like I have it right, but I don’t know for sure (legacy code: I hate it).

<asp:GridView ID="UserListGrid" runat="server"
    OnSorting="UserListGrid_Sort" AllowSorting = "True" AutoGenerateColumns="False"  
    AllowPaging="True" PageSize="25" OnRowDataBound="UserListGrid_RowDataBound" 
    OnPageIndexChanging="UserListGrid_PageIndexChanging">

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    <ItemTemplate>
       <asp:CheckBox ID="ActiveCheck" runat="server" SortExpression="ActiveCheck"/>                                                   
    </ItemTemplate>

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protected void UserListGrid_Sort(object sender, GridViewSortEventArgs e)
{
        // ViewState["CurTab"] = 0;
        DataTable Data = myData.GetSessionRoster(TeamID);
        DataView UserListView = new DataView(Data);
        ViewState["SortDirection"] = myData.ConvertSortDirectionToSql(ViewState["SortDirection"] == null ? "" : ViewState["SortDirection"].ToString());
        UserListView.Sort = e.SortExpression + " " + ViewState["SortDirection"];
        UserListGrid.DataSource = UserListView;
        UserListGrid.DataBind();
}

Is there anything obviously wrong with my sorting? I can provide more code if needed.

As requested, here is UserListGrid_RowDataBound

protected void UserListGrid_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType != DataControlRowType.DataRow)
    {
        return;
    }
    // See which users are active
    CheckBox ActiveCheck = (CheckBox)e.Row.Cells[1].FindControl("ActiveCheck");
    if (ActiveCheck != null)
    {
        ActiveCheck.Enabled = true;
        if (e.Row.Cells[11].Text.Equals("1") && !Page.IsPostBack)
        {
            ActiveCheck.Checked = true;
            ActiveCheck.DataBind();
        }
    }
}

Answer 1

It looks like you’re populating checkboxes not from the data base, but corresponding to the contents of your cell 11 (whatever it is).
I appeal to this code line:

if (e.Row.Cells[11].Text.Equals("1") && !Page.IsPostBack)

While sorting you rebind your gridview, but you restrict populating and rebinding of your checkboxes on postback. This could be a reason for checkboxes loosing values.