我在asp.net c＃中的购物卡项目遇到da.Fill（ds）错误，>

Question

公共局部类AddToCart：System.Web.UI.Page{受保护的void Page_Load（对象发送者，EventArgs e）{如果（！IsPostBack）{DataTable dt = new DataTable（）;DataRow dr;dt.Columns.Add（“ sno”）;dt.Columns.Add（“ ProductID”）;dt.Columns.Add（“ ProductName”）;dt.Columns.Add（“ Price”）;dt.Columns.Add（“ ProductImage”）;dt.Columns.Add（“ Cost”）;dt.Columns.Add（“ TotalCost”）;

        if (Request.QueryString["id"] != null)
        {
            if (Session["Buyitems"] == null)
            {

                dr = dt.NewRow();
                String mycon = "Data Source=DESKTOP-8C66I6S/SQLEXPRESS;Initial Catalog=haritiShopping;Integrated Security=True";
                SqlConnection scon = new SqlConnection(mycon);
                String myquery = "select * from productdetail where ProductID=" + Request.QueryString["id"];
                SqlCommand cmd = new SqlCommand();
                cmd.CommandText = myquery;
                cmd.Connection = scon;
                SqlDataAdapter da = new SqlDataAdapter();
                da.SelectCommand = cmd;
                DataSet ds = new DataSet();
                da.Fill(ds);
                dr["sno"] = 1;
                dr["ProductID"] = ds.Tables[0].Rows[0]["ProductID"].ToString();
                dr["ProductName"] = ds.Tables[0].Rows[0]["ProductName"].ToString();
                dr["ProductImage"] = ds.Tables[0].Rows[0]["ProductImage"].ToString();
                dr["Price"] = ds.Tables[0].Rows[0]["Price"].ToString();
                dt.Rows.Add(dr);
                GridView1.DataSource = dt;
                GridView1.DataBind();
                Session["buyitems"] = dt;
            }
            else
            {

                dt = (DataTable)Session["buyitems"];
                int sr;
                sr = dt.Rows.Count;

                dr = dt.NewRow();
                String mycon = "Data Source=DESKTOP-8C66I6S/SQLEXPRESS;Initial Catalog=haritiShopping;Integrated Security=True";
                SqlConnection scon = new SqlConnection(mycon);
                String myquery = "select * from productdetail where ProductID=" + Request.QueryString["id"];
                SqlCommand cmd = new SqlCommand();
                cmd.CommandText = myquery;
                cmd.Connection = scon;
                SqlDataAdapter da = new SqlDataAdapter();
                da.SelectCommand = cmd;
                DataSet ds = new DataSet();
                da.Fill(ds);
                dr["sno"] = sr + 1;
                dr["ProductID"] = ds.Tables[0].Rows[0]["ProductID"].ToString();
                dr["ProductName"] = ds.Tables[0].Rows[0]["ProductName"].ToString();
                dr["ProductImage"] = ds.Tables[0].Rows[0]["ProductImage"].ToString();
                dr["Price"] = ds.Tables[0].Rows[0]["Price"].ToString();
                dt.Rows.Add(dr);
                GridView1.DataSource = dt;
                GridView1.DataBind();
                Session["buyitems"] = dt;

            }
        }
        else
        {
            dt = (DataTable)Session["buyitems"];
            GridView1.DataSource = dt;
            GridView1.DataBind();

公共局部类AddToCart：System.Web.UI.Page {受保护的无效Page_Load（对象发送者，EventArgs e）{如果（！IsPostBack）{DataTable dt = new DataTable（）; ...

Answer 1

如下更新您的connection string。您没有指定要使用Windows Authentication还是User Id＆Password。