shopping cart total price issue - asp.net

Question

I am working on a shopping cart project for my college project in final page of my cart i want to calculate the total amount for the all the product in the cart help me in that code for that is
for cart.aspx
<asp:GridView ID="GridView1"
runat="server"
AutoGenerateColumns="False"
DataKeyNames="id"
DataSourceID="SqlDataSource1"
EmptyDataText="No Item in the Cart">
<Columns>
<asp:CommandField ShowDeleteButton="True" />
<asp:BoundField DataField="pName"
HeaderText="pName"
SortExpression="pName" />
<asp:BoundField DataField="brand"
HeaderText="brand"
SortExpression="brand" />
<asp:TemplateField HeaderText="img"
SortExpression="img">
<EditItemTemplate>
<asp:TextBox ID="TextBox1"
runat="server"
Text='<%# Bind("img") %>'>
</asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Image ID="Image1"
runat="server"
ImageUrl='<%# Bind("img") %>' />
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="quantity"
HeaderText="quantity"
SortExpression="quantity" />
<asp:BoundField DataField="price"
HeaderText="price"
SortExpression="price" />
</Columns>
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1"
runat="server"
ConnectionString="<% $ConnectionStrings:shopingConnectionString1 %>"
DeleteCommand="DELETE FROM [completeCart] WHERE [id] = #id"
InsertCommand="INSERT INTO [completeCart] ([uName], [pName], [brand], [img], [quantity], [price]) VALUES (#uName, #pName, #brand, #img, #quantity, #price)"
SelectCommand="SELECT * FROM [completeCart] WHERE ([uName] = #uName)"
UpdateCommand="UPDATE [completeCart] SET [uName] = #uName, [pName] = #pName, [brand] = #brand, [img] = #img, [quantity] = #quantity, [price] = #price WHERE [id] = #id">
<DeleteParameters>
<asp:Parameter Name="id" Type="Int64" />
</DeleteParameters>
<InsertParameters>
<asp:Parameter Name="uName" Type="String" />
<asp:Parameter Name="pName" Type="String" />
<asp:Parameter Name="brand" Type="String" />
<asp:Parameter Name="img" Type="String" />
<asp:Parameter Name="quantity" Type="Int32" />
<asp:Parameter Name="price" Type="Int64" />
</InsertParameters>
<SelectParameters>
<asp:CookieParameter CookieName="uname"
Name="uName"
Type="String" />
</SelectParameters>
<UpdateParameters>
<asp:Parameter Name="uName" Type="String" />
<asp:Parameter Name="pName" Type="String" />
<asp:Parameter Name="brand" Type="String" />
<asp:Parameter Name="img" Type="String" />
<asp:Parameter Name="quantity" Type="Int32" />
<asp:Parameter Name="price" Type="Int64" />
<asp:Parameter Name="id" Type="Int64" />
</UpdateParameters>
</asp:SqlDataSource>
for code behind file
protected void Page_Load(object sender, EventArgs e)
{
string s2 = System.Web.HttpContext.Current.User.Identity.Name;
Response.Cookies["uname"].Value = s2;
}
finally the result i want is the total sum of cost of product display on a label control on the same page

Answer 1

Remove the SqlDataSource control. Don't put SQL in aspx page! Create a class that returns cart and calculates grand total. Databind in code behind.

Answer 2

I am thinking of that your cart.aspx page has a grid view for displaying the cart items and prices , then you can do like this....
you can do like this ... Simply in GridView.RowDataBound Event loop gridview and find control contain price amount and sum them
decimal grdTotal = 0;
protected void Page_Load(object sender, EventArgs e)
{
}
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
decimal rowTotal = Convert.ToDecimal(DataBinder.Eval(e.Row.DataItem, "price"));
grdTotal = grdTotal + rowTotal;
}
lbl.Text = grdTotal.ToString("c");
}
}
you can display total price value at the footer of price column .......