asp .net checkbox inside gridview checked - asp.net

Question

I have a main 'Products' table and a 'Products_Recommended' table. I want the users to be able to select several products from a GridView using checkboxes and then insert those Product IDs (prodid) into the Products_Recommended table in such a way that a main Product ID is entered (coming from query string) and potentially several recommended ProdIDs get entered. So far so good.
But I need to be able to show the checkboxes to be checked if there were already prodids in the Products_Recommended table previously.
The code below show a 'sqldatasource1' which gets the data from the Products_Recommended table based on query string. I just don't know how the checkboxes can get checked because the GridView has a different sqldatasource binding it.
Thanks!
Meengla
<form id="form1" runat="server">
<asp:GridView ID="Products" runat="server" AutoGenerateColumns="False" DataKeyNames="prodid"
DataSourceID="alldata" EnableModelValidation="True">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:CheckBox ID="ProductSelector" runat="server" />
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="itemnumber" HeaderText="Item Number" SortExpression="itemnumber" />
<asp:BoundField DataField="itemtitle" HeaderText="itemtitle" SortExpression="itemtitle" />
</Columns>
</asp:GridView>
<p>
<asp:Button ID="SelectedProducts" runat="server" Text="Recommend" OnClick="SelectedProducts_Click" />
</p>
<p>
<asp:Label ID="lblProdSelected" runat="server" EnableViewState="False" Visible="False"></asp:Label>
</p>
<asp:SqlDataSource ID="alldata" runat="server" ConnectionString="<%$ ConnectionStrings:dbconnection %>"
SelectCommand="SELECT * FROM Products">
<SelectParameters>
<asp:QueryStringParameter DefaultValue="14" Name="itemid" QueryStringField="itemid"
Type="Int32" />
</SelectParameters>
</asp:SqlDataSource>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:dbconnection %>"
SelectCommand="SELECT * FROM dbo.products_recommended WHERE prodid = #itemid)">
<SelectParameters>
<asp:QueryStringParameter DefaultValue="14" Name="itemid" QueryStringField="itemid"
Type="Int32" />
</SelectParameters>
</asp:SqlDataSource>

Answer 1

Handle the RowDataBound event, and in the method find the checkbox and set its Checked value.
<asp:GridView ID="Products" OnRowDataBound="GridViewRowEventHandler">
void CustomersGridView_RowDataBound(Object sender, GridViewRowEventArgs e)
{
if(e.Row.RowType == DataControlRowType.DataRow)
{
var ProductSelector = e.Row.FindControl("ProductSelector") as CheckBox;
ProductSelector.Checked = true;
}
}
You can use the Select method of DataSource to retrieve the data you need