How to create virtual id in asp.net using c # for creating shopping cart

Question

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C#

protected void rptsubmenu_ItemCommand(object source, RepeaterCommandEventArgs e)
    {

        Label lblprice = (Label)grdaddcart.FindControl("lblprice");
        if (e.CommandName == "menuitem")
        {


            Response.Cookies["addcart"].Value = sl_con.ExecuteScalar("select iif(isnull(max(Id)),0,max(Id))+1 from tbladdcart", "acs");
            Response.Cookies["addcart"].Expires = DateTime.Now.AddDays(1);
            sl_con.ExecuteNonQuery(@"INSERT INTO tbladdcart
                         (VId, item_id, quant, ad)
VALUES        ("+Response.Cookies["addcart"].ToString()+","+e.CommandArgument.ToString()+","+lblprice.Text+",'"+DateTime.Now.ToString()+"')", "acs");


            Response.Redirect("~/Restaurant_menu.aspx");

        }
    }

[edit]SHOUTING removed - OriginalGriff[/edit]

on click error

The isnull function requires 2 argument(s).

Posted 28-Aug-14 1:15am

KamleshMaurya

Updated 28-Aug-14 1:44am

OriginalGriff

v4

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Comments

[no name] 28-Aug-14 7:21am

Maybe you should add the other argument then.

OriginalGriff 28-Aug-14 7:44am

DON'T SHOUT. Using all capitals is considered shouting on the internet, and rude (using all lower case is considered childish). Use proper capitalization if you want to be taken seriously.

Sanjay K. Gupta 28-Aug-14 8:22am

Where you guys learned, passing parameters to the query in this way. Total disgusting. Please tell me the tutor name. :)

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Richard Deeming · Answer 1 · 2014-08-28T02:26:00

Start by fixing the SQL Injection[^] vulnerability in your code.

Then, make the VId column an IDENTITY column[^].

Finally, insert the record without specifying a value for the VId column, and return the Scope_Identity() value to get the auto-generated ID.

C#

using (var connection = new SqlConnection("YOUR CONNECTION STRING HERE"))
using (var command = new SqlCommand("INSERT INTO tbladdcart (item_id, quant, ad) VALUES (@ItemId, @quant, @ad); SELECT Scope_Identity();", connection))
{
    command.Parameters.AddWithValue("@ItemId", e.CommandArgument);
    command.Parameters.AddWithValue("@quant", lblPrice.Text);
    command.Parameters.AddWithValue("@ad", DateTime.Now);

    int id = (int)command.ExecuteScalar();
    Response.Cookies["addcart"].Value = id.ToString();
    Response.Cookies["addcart"].Expires = DateTime.Now.AddDays(1);
    
    Response.Redirect("~/Restaurant_menu.aspx");
}