Requesr.QueryString() method throw exception

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CSS

I have written the javascript function to open new window and pass parameter. Then I use request.Querystring method to get the parameter from the popup.
But if it get any null value then it throw exception. The exception is "Object reference not set to an instance of an object.". I have provided condition to recover this problem.
But not work. My code is here :

C#

function strgetStyleNo() {
            var a = $("[id$='ddlStyleNo']").val();
            var b = $("[id$='ddlDefectType']").val();

            var d1 = $("[id$='txtFromDate']").val();
            var d2 = $("[id$='txtToDate']").val();
            if (a != "") {
                window.open("Reports/Smt_StyleWiseReportWindow.aspx?Names=" + a + "", "mywindow", "status=1,toolbar=1, width=900px, height=600px,left=250,top=100");
            }
            if (b != "") {
                window.open("Reports/Smt_StyleWiseReportWindow.aspx?defect=" + b + "", "mywindow", "status=1,toolbar=1, width=900px, height=600px,left=250,top=100");
            }
            if (d1 != "") {
                window.open("Reports/Smt_StyleWiseReportWindow.aspx?dt1=" + d1 + "&dt2"+d2+"", "mywindow", "status=1,toolbar=1, width=900px, height=600px,left=250,top=100");
            }
        }

C#

string strStyleCode = "";
                string defecttype = "";
                if (Request.QueryString["Names"].ToString() != "" || Request.QueryString["Names"].ToString() != null)
                {
                     strStyleCode = Request.QueryString["Names"].ToString();
                }
                else if (Request.QueryString["defect"].ToString() != "" || Request.QueryString["defect"].ToString() != null)
                {
                    defecttype = Request.QueryString["defect"].ToString();
                }

Posted 24-Sep-14 18:56pm

Sumon562

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ChauhanAjay · Answer 1 · 2014-09-24T19:02:00

Solution 1

Try the following changes

C#

if (Request.QueryString["Names"].ToString() != "" || Request.QueryString["Names"].ToString() != null)

TO

C#

if (Request.QueryString["Names"] != null)
{
   if (Request.QueryString["Names"].ToString() != "")
   {
      
   }
}

Posted 24-Sep-14 19:02pm

ChauhanAjay

aarif moh shaikh · Answer 2 · 2014-09-24T19:07:00

Just Reverse your Condition code... Means First Check Query String Null Value than Check Blank ("") Value... Example are below..

C#

if (Request.QueryString["Names"].ToString() != null || Request.QueryString["Names"].ToString() != "")
              {
                   strStyleCode = Request.QueryString["Names"].ToString();
              }
              else if (Request.QueryString["defect"].ToString() != null || Request.QueryString["defect"].ToString() != "")
              {
                  defecttype = Request.QueryString["defect"].ToString();
              }

Thanks
AARIF