در قسمت 9 ویدیو یاد داده شد که چگونه دو تا ایتم به سبد خرید اضافه کنیم با این کد ها
protected void AddToShoppingCart_Click(object sender, EventArgs e)
{
Button btn = (Button)sender;
if (Session["shoppingCart"]!= null)
{
Session["shoppingCart"] += "," + btn.ToolTip;
}
else
{
Session.Add("shoppingCart", btn.ToolTip);
}
// Response.Redirect("shoppingCart.aspx");
}
و این کد
protected void Page_Load(object sender, EventArgs e)
{
if (Session["status"] != null &&
Session["status"].ToString() == "Login")
{
//successful login
sql_addedProds.SelectCommand = "SELECT * FROM [Products] WHERE ([id] in ("
+ Session["shoppingCart"].ToString() + "))";
}
else
{
Response.Redirect("login.aspx");
}
}
ولی وقتی دو ایتم یه سبد اضافه می کنم این ارور را می دهد
Server Error in '/' Application.
Input string was not in a correct format.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.FormatException: Input string was not in a correct format.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[FormatException: Input string was not in a correct format.]
System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) +14286670
System.Number.ParseInt32(String s, Num
{
if (Session["status"] != null &&
Session["status"].ToString() == "Login")
{
//successful login
sql_addedProds.SelectCommand = "SELECT * FROM [Products] WHERE ([id] in ("
+ Session["shoppingCart"].ToString() + "))";
}
else
{
Response.Redirect("login.aspx");
}