logical coding error with my task related to querystring

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i am tring to redirect the product ids from main page to productcatalog.aspx page to show some that in a grid on the base of productid from main page and price range..
but i am getting nothing in gridview..

here is the code in main page

C#

dbcon obj = new dbcon();
public string proid;

  protected void Page_Load(object sender, EventArgs e)
  {




  }

  protected void LinkButton4_Click(object sender, EventArgs e)
  {
      //string proid;

         string querydr = "select * from Products";
         SqlDataReader dr = obj.fillcomb(querydr);

          while (dr.Read())
          {

              if(proid != String.Empty)
                {
               proid = dr["ProductID"].ToString();
               }
            else
               {
                   proid += "," + Convert.ToInt16(dr["ProductID"]);
              }


              }



     Response.Redirect("ProductCatalog.aspx?ID="+proid);

and on productcatalog.aspx page.. i am have the fallwing code. caling the fuction on page load of productcatalog.aspx

C#

private void LoadGridView()
   {
        if (Request.QueryString["ID"] != null && Request.QueryString["ID"].ToString() != "")
       {
           string query = "Select * from Products where ProductID= '" + Request.QueryString["ID"].ToString() + "' AND UnitCost < 5000";
                      DataSet dss = obj.fillgrid(query);
           GridView1.DataSource = dss.Tables[0];
           GridView1.DataBind();
       }

and in url i am getting

http://localhost:54681/myfinalproject/ProductCatalog.aspx?ID=65

where is the problem.

Posted 26-Dec-11 6:40am

codegeekalpha

Updated 26-Dec-11 6:46am

theanil

v2

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4 solutions

Solution 1

check this blog
Passing variables between pages using QueryString[^]
--NDK

Posted 26-Dec-11 9:21am

NandaKumer

Solution 3

Why you are using

SQL

if(proid != String.Empty)
                  {

Here is wrong.

Posted 26-Dec-11 18:21pm

Sarvesh Kumar Gupta

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Nigam Patel · Accepted Answer · 2011-12-26T16:32:00

Solution 2

hi farroqspecials

you have to change below condition

if(proid == String.Empty)

Please let me know if this is work for you

Posted 26-Dec-11 16:32pm

Nigam Patel

Manish.Insan · Accepted Answer · 2011-12-26T18:30:00

first check weather you are getting id on your page or not. if yes then check ProductID column of product table is of nvarchar type or numeric.

Because i think that you are passing string ID in table and that is of numeric type so there is mismatch of type.

C#

private void LoadGridView()
   {
        if (Request.QueryString["ID"] != null && Request.QueryString["ID"].ToString() != "")
       {
           string query = "Select * from Products where ProductID= " + Convert.ToInt32(Request.QueryString["ID"].ToString()) + " AND UnitCost < 5000";
                      DataSet dss = obj.fillgrid(query);
           GridView1.DataSource = dss.Tables[0];
           GridView1.DataBind();
       }

Hope this will help you.
Don't forget to mark as answer if it helps. :)