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Editorial Team
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Asked: 2026-06-02T10:50:57+00:00

NOTE: I’m a beginner web developer, somewhat familiar with PHP. I’ve been curious about

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NOTE: I’m a beginner web developer, somewhat familiar with PHP. I’ve been curious about ASP.NET and wanted to give it a go.

Now, I’m attempting to little library application that displays a table like the following:

Title                - Author        - Status
The Eye of the World - Robert Jordan - Checked Out
The Great Hunt       - Robert Jordan - Check Out
The Dragon Reborn    - Robert Jordan - Check Out

I have created a DataSet, and a TableAdapter that performs the following query:

SELECT        books.SerialNumber, books.Title, books.Author, CheckedOut.cardNumber
FROM            books LEFT OUTER JOIN
                         CheckedOut ON books.SerialNumber = CheckedOut.SerialNumber

I do this so that I can get either NULL or the cardNumber for use below.

Here is the current state of my main page:

    <%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"
    CodeFile="Browse.aspx.cs" Inherits="_Default" %>

<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
</asp:Content>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
    <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
        DataKeyNames="SerialNumber,cardNumber" DataSourceID="ObjectDataSource1" 
        OnRowDataBound="browseMethod"
        AllowPaging="True" onselectedindexchanged="GridView1_SelectedIndexChanged">
        <Columns>
            <asp:BoundField DataField="SerialNumber" HeaderText="SerialNumber" 
                InsertVisible="False" ReadOnly="True" SortExpression="SerialNumber" 
                Visible="False" />
            <asp:BoundField DataField="Title" HeaderText="Title" SortExpression="Title" />
            <asp:BoundField DataField="Author" HeaderText="Author" 
                SortExpression="Author" />
            <asp:BoundField DataField="cardNumber" HeaderText="cardNumber" 
                SortExpression="cardNumber" Visible="False" />
            <asp:TemplateField HeaderText="Status">
                <ItemTemplate>
                    <asp:Button ID="Button1" runat="server" 
                        CommandArgument='<%# Eval("cardNumber") %>' 
                        Text="Check Out" />
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
</asp:GridView>
    <asp:ObjectDataSource ID="ObjectDataSource1" runat="server" 
        OldValuesParameterFormatString="original_{0}" SelectMethod="GetLibraryBooks" 
        TypeName="DataSet1TableAdapters.DataTable1TableAdapter">
    </asp:ObjectDataSource>
</asp:Content>

I want to be able to change the “Check Out” button to a label (“Checked Out”) when the “cardNumber” value for that row is NULL. Also, how can I create an event when each button is called, and grab the correct SerialNumber?

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1 Answer

  1. Editorial Team

    You can create another control label and sets its visibity to false.You have already defied command argument for the button.Give a command name too .

    <asp:Button ID="Button1" runat="server"                          CommandArgument='<%# Eval("cardNumber") %>'          CommandName="CheckOut"                 Text="Check Out" />

    In the gridview_rowCommand callback check for the command Name and do the operations.Set the visibility of button to false there and label to true.ANother option woulb be to enable/disable button as discussed in answer above with disabled style being made in a way such that it looks like a label.For grid view command argument refer the follwoing link :-
    http://msdn.microsoft.com/en-us/library/bb907626.aspx

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