How to convert list to string

Question

Hi,

 

This is my view :

 

protected void ButtonSave_OnClick(object sender, EventArgs e)

{

List<Placeholder> _placeholder = (List<Placeholder>)Session["listPlaceholder"];

OrdersModel order = new OrdersModel();

order.UserID = (int)Session["userId"];

order.TemplateID = (int)Session["TemplateID"];

order.Price = ((List<MapAddress>)Session["SelectedAddress"]).Count * 1;

var address = (List<MapAddress>)Session["SelectedAddress"];

_orderBL.ConfirmOrder(address, _placeholder,order);

}

 

and this is my Business Layer :

 

 

public string ConfirmOrder(string address, string _placeholder, OrdersModel order)

{

try

{

OrdersDL _ordersDL = new OrdersDL(); // Creating object of Dataccess

return _ordersDL.ConfirmOrder(address,_placeholder,order); // calling Method of DataAccess

}

catch

{

throw;

}

}

 

But here shows error like cannot convert list to string

 

Please help me.

 

Thanks