Question

I am trying to use the Search Box that is explained in this blog. The problem now I have a GridView inside the Repeater. This GridView will be generated based on the value of the HiddenField. I used the code as explained in the blog but when I tried to use it in my case, I got an error which I don’t know why I am getting it each time. The error that I got was from the code-behind and the error was:

The name ‘GridView1’ does not exist in the current context.

So HOW TO FIX THIS ERROR?

My ASP.NET Code:

<input id=id_search type=text placeholder="Search">


     <br />  <br />  
        <asp:Repeater ID="Repeater1" runat="server" DataSourceID="SqlDataSource1">
            <ItemTemplate>

                <asp:HiddenField ID="HiddenField1" runat="server" Value='<%# Eval("GroupID")%>' />

                <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
                                    ConnectionString="<%$ ConnectionStrings:testConnectionString %>" 
                                    SelectCommandType="StoredProcedure" SelectCommand="kbiReport"
                                    FilterExpression="[DivisionName] like '{0}%'">

                    <FilterParameters>
                        <asp:ControlParameter ControlID="ddlDivision" Name="DivisionName" 
                                                 PropertyName="SelectedValue" Type="String" />
                    </FilterParameters>

                    <SelectParameters>
                        <%--ControlParameter is linked to the HiddenField above to generate different GridView based on different values 
                            of GroupID--%>
                        <asp:ControlParameter ControlID="HiddenField1" Name="GroupID" PropertyName="Value" />
                    </SelectParameters>
                </asp:SqlDataSource>

                <asp:GridView ID="GridView1" runat="server" 
                                AllowSorting="True" 
                                CellPadding="3" 
                                DataSourceID="SqlDataSource1" 
                                ClientIDMode="Static"
                                CssClass="mGrid"
                                AlternatingRowStyle-CssClass="alt" 
                                RowStyle-HorizontalAlign="Center" 
                                OnRowDataBound="GridView1_RowDataBound" OnPreRender="GridView1_PreRender">
                    <AlternatingRowStyle BackColor="White" ForeColor="#284775" />
                    <HeaderStyle Font-Bold = "true" ForeColor="Black"/> 
                    <Columns>
                        <asp:CommandField ShowSelectButton="True" />
                    </Columns>
                    <EditRowStyle BackColor="#999999" />
                    <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
                    <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
                    <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
                    <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
                    <SortedAscendingCellStyle BackColor="#E9E7E2" />
                    <SortedAscendingHeaderStyle BackColor="#506C8C" />
                    <SortedDescendingCellStyle BackColor="#FFFDF8" />
                    <SortedDescendingHeaderStyle BackColor="#6F8DAE" />
                </asp:GridView>

            </ItemTemplate>
        </asp:Repeater>

        <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
                           ConnectionString="<%$ ConnectionStrings:testConnectionString %>"
                           SelectCommand="SELECT DISTINCT GroupID FROM courses">
        </asp:SqlDataSource>

My Code-Behind:

protected void GridView1_PreRender(object sender, EventArgs e)
    {
        if (GridView1.Rows.Count > 0)
        {
            GridView1.UseAccessibleHeader = true;
            GridView1.HeaderRow.TableSection = TableRowSection.TableHeader;
        }
    }

Answer 1

You can’t reference controls directly when they are placed inside repeaters (and other controls with templating).

In your case, the event PreRender is triggered by the GridView so sender must my your grid:

protected void GridView1_PreRender(object sender, EventArgs e)
{
    var myGrid = sender as GridView;
    if (myGrid.Rows.Count > 0)
    {
        myGrid.UseAccessibleHeader = true;
        myGrid.HeaderRow.TableSection = TableRowSection.TableHeader;
    }
}