Conditional render on a gridview - asp.net

Question

I have this GridView:
<asp:GridView CssClass="table table-hover mt-5" ID="OrderTable" runat="server" AutoGenerateColumns="False" DataKeyNames="Identificativo" DataSourceID="DBGestioneOrdini" OnPreRender="GridView_PreRender">
<Columns>
<asp:BoundField DataField="Identificativo" HeaderText="Identificativo" InsertVisible="False" ReadOnly="True" SortExpression="Identificativo" />
<asp:TemplateField HeaderText="Genera Fattura" HeaderStyle-CssClass="text-center" ItemStyle-VerticalAlign="Middle" ItemStyle-HorizontalAlign="Center">
<ItemTemplate>
<asp:LinkButton type="button" ID="generateInvoiace" runat="server" OnClick="generateInvoiace_Click" ForeColor="Black" CommandName="SelectRow" CommandArgument='<%# Eval("Identificativo") %>'>
<i class="fa-solid fa-file-invoice-dollar fa-lg>
</i>
</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
It takes the data from an Order Table. The problem here is that I need to disable the clickable icon for every record which have a specific value on a field of the db ... I can't actually realize how can i modify only certain icons since the table is rendered by asp.net and not manually

Answer 1

Ok, so say we have this grid view:
<asp:GridView ID="GHotels" runat="server" AutoGenerateColumns="False"
DataKeyNames="ID" CssClass="table">
<Columns>
<asp:BoundField DataField="FirstName" HeaderText="FirstName" />
<asp:BoundField DataField="LastName" HeaderText="LastName" />
<asp:BoundField DataField="HotelName" HeaderText="HotelName" />
<asp:TemplateField>
<ItemTemplate>
<asp:CheckBox ID="chkActive" runat="server" Checked='<%# Eval("Active") %>' />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Hotel Information" ItemStyle-HorizontalAlign="Center">
<ItemTemplate>
<asp:Button ID="cmdView" runat="server" Text="Info" CssClass="btn"
OnClick="cmdView_Click" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
And our code to load the grid view could be this:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Not IsPostBack Then
LoadGrid
End If
End Sub
Sub LoadGrid()
Dim rstData As DataTable
rstData = MyRst("SELECT * FROM tblHotelsA ORDER BY HotelName")
GHotels.DataSource = rstData
GHotels.DataBind()
End Sub
Public Function MyRst(strSQL As String) As DataTable
Dim rstData As New DataTable
Using conn As New SqlConnection(My.Settings.TEST4)
Using cmdSQL As New SqlCommand(strSQL, conn)
conn.Open()
rstData.Load(cmdSQL.ExecuteReader)
rstData.TableName = strSQL
End Using
End Using
Return rstData
End Function
So no loops, just send a data table to the grid, and we now have this:
However, lets say we ONLY want the info button to show for when the hotel is active.
so, for things like totals, time formatting, color formatting, or whatever?
You use the row data bound event.
So, we can add to above this event that will "hide" the info button for any row in which the hotel is not active.
So, this code:
Protected Sub GHotels_RowDataBound(sender As Object, e As GridViewRowEventArgs) Handles GHotels.RowDataBound
If e.Row.RowType = DataControlRowType.DataRow Then
Dim chkActive As CheckBox = e.Row.FindControl("chkActive")
Dim cmdView As Button = e.Row.FindControl("cmdView")
If chkActive.Checked = False Then
' hide the info button
cmdView.Style.Add("display", "none")
End If
End If
End Sub
So, as noted, for running totals, highlght a row, color a row - or in this simple case hide/show the info button based on active column?
(and note you are NOT limited to just the controls on that row - you have full use of the whole database row if you wish durng the binding).
And we now see/get this:
And note once again, no looping or for next code.