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Old December 22nd, 2008, 02:31 AM
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Default C# Syntax problem

I'd like to make a change to an existing ASP.NET 2.0 commerce site so that certain products are flagged with a warning label. The website's product details page already uses such boolean-triggered flags for other product information, so I have copied the existing format to add a path for this additional boolean field from the .cs page back through the DAL, the stored procedure, and the database's products table.

I have the new flag's asp:Image tag in place on the .aspx page, but I am not sure where to place the switching code on the .cs page so as not to create a compile or runtime error.

Here is a cut-down version of the Product Detail page's .cs file showing what I hope are the relevant parts (a copy of the full .cs page is here):
namespace MySite
    public partial class productdetail : System.Web.UI.Page
        protected System.Web.UI.WebControls.Image Image1;
                //[a series of WebControl declarations here]
        protected System.Web.UI.WebControls.Image imgNew;
                //["imgNew" is one of the existing boolean flags]

public void BindTheData()
        .... code ....

            if (!errorFlg)
                if (dataset.Tables[0].Rows.Count > 0)
                DataRow tr = dataset.Tables[0].Rows[0];
                imgProduct.ImageUrl = "images/products/" +tr["IMAGEFILE_NM"].ToString();
                litName.Text = "<h3 id='detName'>" + tr["NAME"].ToString() +"</h3>";
                    //Create the grades label
                    string from_grade = tr["FROM_GRADE"].ToString();
                    string to_grade = tr["TO_GRADE"].ToString();
                    if (from_grade.Length > 0 && to_grade.Length > 0)
                        lbGrades.Text = "Grades "+ from_grade + " - " + to_grade;
                    if (from_grade == to_grade)
                        lbGrades.Text = "Grade "+ from_grade;
                    if (from_grade.Length > 0 && to_grade.Length == 0)
                        lbGrades.Text = "Grades "+ from_grade + "+";
                    if (from_grade.Length == 0 && to_grade.Length == 0)
                        lbGrades.Text = "";

                    lbContent.Text = tr["NSES_NM"].ToString();
                    lbDescription.Text = tr["DESCRIPTION"].ToString();

                      //Remove these icons from the ProductLine1/ProductLine11 products

                    string topic_id = tr["TOPIC_CD"].ToString();
                    if (topic_id != "1" || topic_id != "11")
                        //Format the image icons representing award, resource

                        string awardFlg = tr["award_flg"].ToString();
                        string ResourceFlg = tr["resource_flg"].ToString();
                        if (awardFlg == "1")
                            imgAward.Visible = true;
                        if (ResourceFlg == "1")
                            imgResource.Visible = true;

I want the flags to apply to all products, not just the "if (topic_id != "1" || topic_id != "11"" ones mentioned above. I have tried to insert a copy of the code for one of the preexisting flags:
string MyNewFlg = tr["my_new_flg"].ToString();
if (MyNewFlg == "1")
    imgMyNewFlag.Visible = true;
If I place the new flag code either inside or outside of the topic_id exclusion the solution builds OK, I get the following runtime error:
Column 'my_new_flg' does not belong to table Table...
Exception Details: System.ArgumentException: Column 'my_new_flg' does not belong to table Table.
Is the code I am imitating creating some sort of dynamic table, and that is causing the screwup? Should I be using something like
if (productTable.MyNewFlagColumn > 0)
               MyNewFlag.Visible = true;
Thanks for any advice.
Old December 23rd, 2008, 01:00 PM
Imar's Avatar
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Join Date: Jun 2003
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Hi there,

Aren't the columns that are working not just a part of a SQL clause that is used to fill the DataSet / DataTable in the first place?

Imar Spaanjaars
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Author of Beginning ASP.NET 4.5 : in C# and VB, Beginning ASP.NET Web Pages with WebMatrix
and Beginning ASP.NET 4 : in C# and VB.
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