Question

Hey all i am wondering if it was possible to evaluate the datafield each time it places a new record into a row?

my gridview code is this:

<asp:Panel ID="pnlGrid" runat="server">
    <div class="left_main_container" style="margin-bottom:20px;">
        <asp:GridView ID="grdView" runat="server" CssClass="GridViewStyle"
            AutoGenerateColumns="False" GridLines="None" Width="100%">
            <Columns>
                <asp:BoundField DataField="id" Visible="False" />
                <asp:BoundField DataField="theName" HeaderText="Name" />
                <asp:BoundField DataField="status" HeaderText="Status" />
            </Columns>
            <RowStyle CssClass="RowStyle" />
            <EmptyDataRowStyle CssClass="EmptyRowStyle" />
            <PagerStyle CssClass="PagerStyle" />
            <SelectedRowStyle CssClass="SelectedRowStyle" />
            <HeaderStyle CssClass="HeaderStyle" />
            <EditRowStyle CssClass="EditRowStyle" />
            <AlternatingRowStyle CssClass="AltRowStyle" />
        </asp:GridView>
    </div>
</asp:Panel>

The field i need to evaluate is status. I need to find out if the status is yes or if its no. If its no then i need to make it a link for the user to be able to change it to a yes.

The gridview is populated by this code:

    Dim objConn As MySqlConnection
    Dim objCmd As MySqlCommand

    objConn = New MySqlConnection(strConnString)
    objConn.Open()

    Dim strSQL As String
    strSQL = "SELECT id, status, " & _
                "CONCAT(' ', first_name, last_name) AS theName " & _
             "FROM(builder_requests) " & _
             "ORDER BY status, id DESC;"

    Dim dtReader As MySqlDataReader
    objCmd = New MySqlCommand(strSQL, objConn)
    dtReader = objCmd.ExecuteReader()

    grdView.DataSource = dtReader
    grdView.DataBind()

    dtReader.Close()
    dtReader = Nothing

    objConn.Close()
    objConn = Nothing

Any help would be great!

Answer 1

I like to use a TemplateField and a function in your code-behind to do this sort of thing.

I am assuming your status field is a string field not boolean but if not let me know and I can adjust the example.

Replace your BoundField with…

Markup:

        <asp:TemplateField>
            <ItemTemplate>
                <%# Eval("status")%>&nbsp;
                <asp:LinkButton ID="cmdChangeStatus" runat="server" CommandName="ChangeStatusToYes" CommandArgument='<%# Eval("id") %>'
                    Visible='<%# SetChangeStatusVisibility(Eval("status")) %>'>Change to Yes</asp:LinkButton>
            </ItemTemplate>
        </asp:TemplateField>

And add code behind function…

Code:

Protected Function SetChangeStatusVisibility(status As Object) As String
    Dim strStatus As String = status.ToString()
    If strStatus = "no" Then
        Return "True"
    Else
        Return "False"
    End If
End Function

Then you can handle the GridView.RowCommand event to change the status value based on the id value in CommandArgument 🙂