All Things .NET

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2.03.2005

I know this is uber-easy stuff, but I'm always wishing I had a simple example of aspx page with all the code (html markup + c# code) all in the same page.

This is from MS QuickStart tutorials, ASP.NET DataGrid with template columns, ItemCommand event handling, etc. Code is in a server-side script tag (runat = server).

QuickStarts Source Control Viewer

Page in action here

Question for a guru somewhere: how does the Page_Load() method get called? Usually in the IDE supported code-behind page, in InitializeComponent(), the Page.Load event is wired up to Page_Load(). Here in an aspx page only, who calls Page_Load()??

There's a lot to show on this single blog entry, but here is the code in case they move/bail the page someday.


<% @Import Namespace="System.Data" %>



<html>



<script language="c#" runat="server">



    DataTable Cart;

    DataView CartView;

    

	ICollection CreateDataSource() 

	{

        DataTable dt = new DataTable();

        DataRow dr;



        dt.Columns.Add(new DataColumn("IntegerValue", typeof(Int32)));

        dt.Columns.Add(new DataColumn("StringValue", typeof(string)));

        dt.Columns.Add(new DataColumn("DateTimeValue", typeof(DateTime)));

        dt.Columns.Add(new DataColumn("BoolValue", typeof(bool)));

        dt.Columns.Add(new DataColumn("CurrencyValue", typeof(double)));

        

		for ( int i = 0; i<9; i++) {

            dr = dt.NewRow();

            dr[0] = i;

            dr[1] = "Item " + i.ToString();

            dr[2] = DateTime.Now;

            dr[3] = (i % 2 != 0) ? true : false;

            dr[4] = 1.23 * (i+1);

            dt.Rows.Add(dr);

            

        }

        

		DataView dv = new DataView(dt); 

		return dv;       

	}



	void Page_Load( Object sender, EventArgs e )

	{

        if (Session["DG5_ShoppingCart"] == null) {

            Cart = new DataTable();

            Cart.Columns.Add(new DataColumn("Item", typeof(string)));

            Cart.Columns.Add(new DataColumn("Price", typeof(string)));

            Session["DG5_ShoppingCart"] = Cart;

        }

        else {

            Cart = (DataTable)Session["DG5_ShoppingCart"];

        }    

        CartView = new DataView(Cart);

        ShoppingCart.DataSource = CartView;

        CartView.Sort="Item";

        ShoppingCart.DataBind();	

        

		MyDataGrid.DataSource = CreateDataSource(); 

		MyDataGrid.DataBind();

	}

	

    void Grid_CartCommand(object sender, DataGridCommandEventArgs e) {

    

        DataRow dr = Cart.NewRow();

        

        // e.Item is the row of the table where the command fired

        // For bound columns the value is stored in the Text property of TableCell

        TableCell itemCell = e.Item.Cells[1];

        TableCell priceCell = e.Item.Cells[2];

        string item = itemCell.Text;

        string price = priceCell.Text;

        

        if (((LinkButton)e.CommandSource).CommandName == "AddToCart") {

            dr[0] = item;

            dr[1] = price;

            Cart.Rows.Add(dr);

        }

        else {   //Remove from Cart

        

            CartView.RowFilter = "Item='"+item+"'";

            if (CartView.Count > 0) {    

                CartView.Delete(0);

            }

            CartView.RowFilter = "";

        }

        ShoppingCart.DataBind();

    }	

	

</script>



	

	

<body>



    <h3><font face="Verdana">Using a Template Column in DataGrid</font></h3>



    <form runat=server>



    <table cellpadding="5">

    <tr valign="top">

    <td>



    <b>Product List</b>

    <asp:DataGrid id="MyDataGrid" runat="server"

        BorderColor="black"

        BorderWidth="1"

        GridLines="Both"

        CellPadding="3"

        CellSpacing="0"

        Font-Name="Verdana"

        Font-Size="8pt"

        HeaderStyle-BackColor="#aaaadd"

        AutoGenerateColumns="false"

        OnItemCommand="Grid_CartCommand"

        >

        <Columns>

            <asp:TemplateColumn HeaderText="Add/Remove">

                <ItemTemplate>

                    <asp:LinkButton ID=AddButton Text="Add" CommandName="AddToCart" 

							ForeColor="blue" runat="server" /> 

                    <asp:LinkButton ID=RemoveButton Text="Remove" CommandName="RemoveFromCart" 

							ForeColor="blue" runat="server" />

                </ItemTemplate>

            </asp:TemplateColumn>

            

            <asp:BoundColumn HeaderText="Item" DataField="StringValue"/>

            <asp:BoundColumn HeaderText="Price" DataField="CurrencyValue" 

					DataFormatString="{0:c}" ItemStyle-HorizontalAlign="right" />

            

            <asp:TemplateColumn HeaderText="Assembly required?">

                <ItemTemplate>

                    <asp:CheckBox ID=Chk1 

                    Checked='<%# DataBinder.Eval(Container.DataItem, "BoolValue") %>' 

                    Enabled="false" runat="server" />

                </ItemTemplate>

            </asp:TemplateColumn>

        </Columns>

    </asp:DataGrid>



    </td><td>



    <b>Shopping Cart</b>

    <asp:DataGrid id="ShoppingCart" runat="server"

        BorderColor="black"

        BorderWidth="1"

        CellPadding="3"

        Font-Name="Verdana"

        Font-Size="8pt"

        HeaderStyle-BackColor="#aaaadd"

        />



    </td>

    </tr>

    </table>



  </form>



</body>



</html>

posted by dan @ 9:02 PM | 0 comments | PermaLink URL |

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