Question

I created a master page (my template page) and i place a gridview on it. Now I will create mutiple pages (aspx) that will use this master page. Instead of doing all the setup for these aspx pages, all I have to do is configure a datasource. When the aspx loads it connects the datasource to the gridview (on the master page) and it loads. Now I would like to manipulate data inside the gridview but my datakeys count is returning 0. I can access values via gv.Rows(dr.RowIndex).Cells(5) for example. But I want to do it via the data keys. My code is below, any help is appreciated. thanks.

Public Sub ConnectDataSource()
    Dim mpContentPlaceHolder As ContentPlaceHolder
    Dim gv As GridView
    mpContentPlaceHolder = CType(Master.FindControl("GridViewPlaceHolder"), ContentPlaceHolder)
    If Not mpContentPlaceHolder Is Nothing Then
        gv = CType(mpContentPlaceHolder.FindControl("GridView1"), GridView)
        If Not gv Is Nothing Then
            Dim es As EntityDataSource = EntityDataSource1
            gv.DataSource = es
            gv.DataBind()
            Debug.WriteLine("datakey count  " + gv.DataKeys().Count.ToString())
            ' gv.HeaderRow.Cells(2).Text = "sdfds" // to change header text for each column.
        End If
    End If
End Sub

Private Sub PaymentRules_Load(sender As Object, e As EventArgs) Handles Me.Load
    Dim toolbarPlaceHolder As ContentPlaceHolder
    Dim btn As ImageButton
    toolbarPlaceHolder = CType(Master.FindControl("ToolBarPlaceHolder"), ContentPlaceHolder)
    If Not toolbarPlaceHolder Is Nothing Then
        btn = DirectCast(toolbarPlaceHolder.FindControl("ImageButton2"), ImageButton)
        If Not btn Is Nothing Then
            AddHandler btn.Click, AddressOf ImageButton2_Click
        End If
    End If
    If (Not Page.IsPostBack) Then
        ConnectDataSource()
    End If
End Sub
Protected Sub ImageButton2_Click(sender As Object, e As EventArgs)
    Debug.WriteLine("ImageButton2_Click")
    Dim maList As New List(Of Integer)
    Dim mContentPlaceHolder As ContentPlaceHolder
    Dim gv As GridView
    mContentPlaceHolder = CType(Master.FindControl("GridViewPlaceHolder"), ContentPlaceHolder)
    If Not mContentPlaceHolder Is Nothing Then
        gv = CType(mContentPlaceHolder.FindControl("GridView1"), GridView)
        If Not gv Is Nothing Then
            For Each dr As GridViewRow In gv.Rows
                If ((TryCast(dr.FindControl("CheckBox1"), CheckBox)).Checked = True) Then
                    'Debug.WriteLine(dr.RowIndex.ToString())
                    'Dim id As Integer = gv.DataKeys(dr.RowIndex).Value
                    'maList.Add(id)
                    Debug.WriteLine("row index " + gv.Rows(dr.RowIndex).Cells(5).Text)
                    Debug.WriteLine("datakey count  " + gv.DataKeys().Count.ToString())
                End If
            Next
        End If
    End If
End Sub

EDITED - Master Page Code

<%@ Master Language="VB" AutoEventWireup="false" CodeBehind="JSPSite.master.vb" Inherits="SSPayroll.JSPSite" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title></title>
    <link href="~/Styles/Site.css" rel="stylesheet" type="text/css" />
    <link href="../Styles/Style1.css" rel="stylesheet" type="text/css" />
    <asp:ContentPlaceHolder ID="HeadContent" runat="server">
    </asp:ContentPlaceHolder>
</head>
<body>
    <form id="Form1" runat="server">
    <div class="page">
        <div class="header">
            <div class="title">

            <h1>
                <asp:Image ID="Image1" runat="server" ImageUrl="~/images/GSCV1.01 - Copy.png" 
                    Height="73px" style="margin-top: 20px" Width="428px" />
            </h1>
            </div>

            <div class="loginDisplay">
                <asp:LoginView ID="HeadLoginView" runat="server" EnableViewState="false">
                    <LoggedInTemplate>
                        <asp:Label ID="Label2" runat="server" Text="User: " Font-Names="Cambria"></asp:Label><span class="bold">
                            <asp:LoginName ID="HeadLoginName" runat="server" Font-Names="Cambria" />
                        </span> [
                        <asp:LoginStatus ID="HeadLoginStatus" runat="server" LogoutAction="Redirect"
                            LogoutPageUrl="~/" Font-Names="Cambria" Font-Size="Small" ForeColor="#D9D5D5" Font-Bold="True" LogoutText="Sign Out" />
                        ]
                                            <div>

                </div>
                    </LoggedInTemplate>
                    <RoleGroups>
                        <asp:RoleGroup>
                        </asp:RoleGroup>
                    </RoleGroups>
                </asp:LoginView>   
                <asp:Label ID="Label1" runat="server" Text="Date/Time" Font-Names="Cambria" 
                        Font-Size="Small" ForeColor="#333333"></asp:Label>            
             </div>

            <div class="clear hideSkiplink">
                <asp:Menu ID="NavigationMenu" runat="server" CssClass="menu" EnableViewState="False"
                    IncludeStyleBlock="False" Orientation="Horizontal" BackColor="#FFFBD6" 
                    DynamicHorizontalOffset="2" Font-Names="Verdana" Font-Size="0.8em" 
                    ForeColor="#990000" StaticSubMenuIndent="10px" Enabled="True">
                    <DynamicHoverStyle BackColor="#990000" ForeColor="White" />
                    <DynamicMenuItemStyle HorizontalPadding="5px" VerticalPadding="2px" />
                    <DynamicMenuStyle BackColor="#FFFBD6" />
                    <DynamicSelectedStyle BackColor="#FFCC66" />
                    <Items>
                                            <asp:MenuItem  Text="Menu1" Value="Tools">
                                                <asp:MenuItem NavigateUrl="~/JSPayroll/Payment_Rules/PaymentRules.aspx" Text="Payment Rules" Value="Payment Rules"></asp:MenuItem>
                        </asp:MenuItem>

                    </Items>
                    <StaticHoverStyle BackColor="#990000" ForeColor="White" />
                    <StaticMenuItemStyle HorizontalPadding="5px" VerticalPadding="2px" />
                    <StaticSelectedStyle BackColor="#FFCC66" />
                </asp:Menu>
            </div>  
        </div> 
        <asp:ContentPlaceHolder ID="ToolBarPlaceHolder" runat="server" >
           <asp:Panel ID="Panel1" runat="server" HorizontalAlign="Center">
              <div>
                <hr />
                <asp:ImageButton ID="ImageButton1" runat="server" Height="48px" ImageUrl="~/IconsPack/Home.png" Width="48px" ToolTip="Home" CssClass="morph" />
                <asp:ImageButton ID="ImageButton2" runat="server" Height="48px" ImageUrl="~/IconsPack/Add.png" ToolTip="Add Record" CssClass="morph" Width="48px"/>
                <asp:ImageButton ID="ImageButton3" runat="server" Height="48px" ImageUrl="~/IconsPack/Edit E.png" ToolTip="Edit Record" CssClass="morph" Width="48px" />
                <asp:ImageButton ID="ImageButton4" runat="server" Height="48px" ImageUrl="~/IconsPack/ViewDetails.png" ToolTip="View Record Details" CssClass="morph" Width="48px" />
                <asp:ImageButton ID="ImageButton5" runat="server" Height="48px" ImageUrl="~/IconsPack/Delete.png" ToolTip="Delete Record" CssClass="morph" Width="48px" />
                <asp:ImageButton ID="ImageButton6" runat="server" Height="48px" ImageUrl="~/IconsPack/Approved.png" ToolTip="Approve Record" CssClass="morph" Width="48px"/>
                <asp:ImageButton ID="ImageButton7" runat="server" Height="48px" ImageUrl="~/IconsPack/Denied.png" ToolTip="Unapprove Record" CssClass="morph" Width="48px"/>
                <asp:ImageButton ID="ImageButton8" runat="server" Height="48px" ImageUrl="~/IconsPack/Update.png" ToolTip="Refresh Table" CssClass="morph" Width="48px"/>
                <hr />
            </div>
        </asp:Panel>
        </asp:ContentPlaceHolder> 

        <%--<asp:ContentPlaceHolder ID="GridViewPlaceHolder" runat="server">--%>
            <div class="EU_TableScroll" id="showData" style="display: block">
                <asp:GridView ID="GridView1" runat="server" CssClass="EU_DataTable" EmptyDataText="No Data Available.">
                    <Columns>
                        <asp:TemplateField>
                            <ItemTemplate>
                                <asp:CheckBox ID="CheckBox1" runat="server" />  
                            </ItemTemplate>
                        </asp:TemplateField>
                    </Columns>

                </asp:GridView>
            </div>
        <%--</asp:ContentPlaceHolder>--%>
        <div class="main">
                    <asp:ContentPlaceHolder ID="MainContent" runat="server">
                    </asp:ContentPlaceHolder>
        </div>
        <div class="clear">          
        </div>
    </div>
    <div class="footer">
    </div>
    </form>
</body>
</html>
Was it helpful?

Solution

Put ImageButtons and GridView and EntityDataSource out of ContentPlaceHolde.
You do not neet use FindControl but to CheckBox.
In GridView1 set DataKeyNames property to your key.

OTHER TIPS

Have you set the DataKeyNames property on the Gridview .aspx side. Check below sample code from msdn. If you set DataKeyNames property then only I think you might be able to access the DataKeys property in the code behind. 

<asp:gridview id="CustomersGridView" 
        datasourceid="CustomersSource" 
        autogeneratecolumns="true"
        emptydatatext="No data available." 
        autogenerateselectbutton="true"    
        datakeynames="CustomerID"
        onselectedindexchanged="CustomersGridView_SelectedIndexChanged"
        runat="server">

      </asp:gridview>
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