Unable to show total sum in datalist

Question

Hi people i am working on a e-commerce project, to store items in shopping cart i have use DataTable with session as given below

 

(Creating Shopping Cart on page load) 

 

if (Session["basket"] == null)

{

dtcart.Columns.Add(new DataColumn("Productimg", typeof(string)));

dtcart.Columns.Add(new DataColumn("ProductID", typeof(int)));

dtcart.Columns.Add(new DataColumn("Name", typeof(string)));

dtcart.Columns.Add(new DataColumn("Quantity", typeof(int)));

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

Session["basket"] = dtcart;

}

else

{

dtcart = (DataTable)Session["basket"];

}

 

 

(For  Adding items to cart i have use following code) 

 

 

Boolean blnMatch = false;

dtcart = (DataTable)Session["basket"];

foreach (DataRow row in dtcart.Rows)

{

if (int.Parse(row["ProductID"].ToString()) == Convert.ToInt32(lblprodid.Text))

{

row["Quantity"] = (int)row["Quantity"] + 1;

string script = "alert(\"Item Already Added to Shopping Cart.!\");";

ScriptManager.RegisterStartupScript(this, GetType(),"ServerControlScript", script, true);

Session["basket"] = dtcart;

blnMatch = true;

break;

}

}

if (!blnMatch)

{

int qty = 1;

//dtcart.Rows.Add(new object[] { lblprodid.Text, lblprodname.Text, prodImage.ImageUrl.Trim().ToString(), lblprodprice.Text });

dtcart.Rows.Add(new object[] { lblimgsrc.Text, lblprodid.Text, lblprodname.Text,Convert.ToString(qty),lblprodprice.Text});

Session["basket"] = dtcart;

}

 

 

On View Cart Page i have used DataList control to view items in shopping cart, However i am able to view all item details except the total  amount of shopping cart, it will get updated when i update the quantity, although i already have tried datalist OnItemCommand and OnItemDataBound properties but i am unable to get the desired output.

 

 screen shot of cart is as :  

 I want this total to be calculated as soon as the product is added to cart, as this is only working with onupdatecommand="DataList1_UpdateCommand"