Query string problem in C#

First -- This is more of an ASP.NET question than C# and should be posted in the ASP.NET forum. A moderate will move it for you so please don't create a new thread.

Second -- You should consider marking your threads solved as you find answers for them. Eventually people will stop helping you out if you never mark a thread solved.

Last -- You need to make a concious effort to pass the query string along when you redirect to the next page. Take this as an example:

public partial class frmDevex : System.Web.UI.Page
  {
    protected void Page_Load(object sender, EventArgs e)
    {
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
      string rawQuery = Request.QueryString.ToString();
      if (!string.IsNullOrEmpty(rawQuery))
        rawQuery = "?" + rawQuery;
      Response.Redirect(@"/frmDevex2.aspx" + rawQuery);
    }
  }

namespace daniweb.web
{
  public partial class frmDevex2 : System.Web.UI.Page
  {
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void Button1_Click(object sender, EventArgs e)
    {
      string rawQuery = Request.QueryString.ToString();
      if (!string.IsNullOrEmpty(rawQuery))
        rawQuery = "?" + rawQuery;
      Response.Redirect(@"/frmDevex.aspx" + rawQuery);
    }
  }
}

These two pages call eachother back and forth and pass on the query string so it is not lost. This is likely the reason you're not receiving the value in your BLL.