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How do I manage to show my button when I have choosed what I want in my GridView

Mickeys
Mickeys asked
on
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Last Modified: 2012-05-06
I am using the code belowe. When I have added som stuff in my shoppingcart I want a button to show up where it says checkout.
How do I do that? I dont want it to show up until I have added something in my shoppingcart.

Also when I press this button I want the stuff in it to come with me.

code would be great.

<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SqlClient" %>
<%@ Import Namespace="System.Collections.Generic" %>
<%@ Import Namespace="ProjektFilm" %>
 
<html>
<head>
<title>ButtonField ButtonType Example</title>
 
 
<script language="C#" runat="server">
DataTable Cart;
DataView CartView;
 
void Page_Load(Object src, EventArgs e)
{
    if (!IsPostBack)
    {
 
        myGrid.DataSource = (List<Filminfo>)Session["film"];
        myGrid.DataBind();
    }
 
    if (Session["shoppingSession"] == null)
    {
        Cart = new DataTable();
        Cart.Columns.Add(new DataColumn("Item", typeof(string)));
        Cart.Columns.Add(new DataColumn("Price", typeof(string)));
        Session["shoppingSession"] = Cart;
    }
    else Cart = (DataTable)Session["shoppingSession"];
 
    CartView = new DataView(Cart);
    shopCart.DataSource = CartView;
    shopCart.DataBind();
}
 
void updateCart(Object src, GridViewCommandEventArgs e)
{
    DataRow dr = Cart.NewRow();
 
    // get the row index stored in the CommandArgument property
    int index = Convert.ToInt32(e.CommandArgument);
 
    // get the GridViewRow where the command is raised
    GridViewRow selectedRow = ((GridView)e.CommandSource).Rows[index];
 
    // for bound fields, values are stored in the Text property of Cells [ fieldIndex ]
    string item = selectedRow.Cells[1].Text;
    string price = selectedRow.Cells[2].Text;
 
    if (e.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 = "";
    }
    shopCart.DataBind();
}
   
</script>
</head>
 
<body>
 
<div class="header"><h3>ButtonField <span class="hilite">ButtonType</span> Example</h3></div>
 
 
<form id="Form1" runat="server">
 
<table cellpadding="5">
<tr valign="top">
   <td><b>Product List</b>
 
      <asp:gridview id="myGrid" runat="server"
         cellpadding=5 font-size="8pt"
         gridlines="horizontal"
         autogeneratecolumns=false         
         onRowCommand="updateCart">
 
         <headerstyle backcolor="darkslategray"
            forecolor="khaki" font-bold />
 
         <rowstyle backcolor="ivory" verticalalign="top" />
 
         <columns>
            
            <asp:boundfield 
            datafield="Titel" 
            readonly="true" 
            headertext="Titel"/>
 
            <asp:boundfield 
            datafield="Genre" 
            readonly="true" 
            headertext="Genre"/>
            
            <asp:boundfield 
            datafield="Artikelnr" 
            readonly="true" 
            headertext="Artikelnr"/>
            
            <asp:boundfield 
            datafield="Regissor" 
            readonly="true" 
            headertext="Regissor"/>
            
                        <asp:boundfield 
            datafield="RentCost" 
            readonly="true" 
            headertext="RentCost"/>
            
            
            
            <asp:buttonfield
               text=" + "
               buttontype="button"
               commandname="AddToCart"  />
 
            <asp:buttonfield
               text=" - "
               buttontype="button"
               commandname="RemoveFromCart" />
 
         </columns>
 
      </asp:gridview>
   </td>
 
   <td><b>Shopping Cart</b>
 
      <asp:gridview id="shopCart" runat="server"
         cellpadding=5 font-size="8pt"
         headerstyle-backcolor="darkslategray"
         headerstyle-forecolor="khaki"
         headerstyle-font-bold
         rowstyle-backcolor="ivory"
         rowstyle-verticalalign="top" />
 
   </td></tr>
</table>
 
</form>
 
<hr size=1 width=90%>
 
</body>
</html>

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