How to handel querystring in asp.net

Posted Date: 13 Jun 2012 Posted By:: Manohar Member Level: Silver Member Rank: 893 Points: 2 Responses: 5

in my application i used linkbutton and button to redirect to same page . i used query string in linkbutton and button control. if i clicked on button control it goes to page and display error that nullrefrence exception was unhandeled by user of linkbutton querystring value.

Responses

#675263 Author: Anil Kumar Pandey Member Level: Platinum Member Rank: 1 Date: 13/Jun/2012 Rating: Points: 2
The value of the Query string might be coming as Null. Please bind the value correctly as `<asp:LinkButton ID="lnkName" runat="server" PostBackUrl='<%# Eval("ID", "Test.aspx?ID={0}") %>'></asp:LinkButton>` Thanks & Regards Anil Kumar Pandey Microsoft MVP, DNS MVM

#675310 Author:

sudhajosyula Member Level: Gold Member Rank: 46 Date: 13/Jun/2012 Rating: 2 out of 5

Points: 2

try the code below as:


protected void button1_click(object sender,eventargs e)
{
   string sno=1;
   Response.Redirect("Test.aspx?ID="+sno);
}
protected void lnkbtn_click(object sender,eventargs e)
{
   string h=9;
   Response.Redirect("Test.aspx?ID="+h);
}

#675322 Author: Asheej T K Member Level: Diamond Member Rank: 2 Date: 13/Jun/2012 Rating: Points: 2
Hi, can you post the code you are using to assign the query string and read the query string. It seems you are not assigning the query string value properly. Regards, Asheej T K Microsoft MVP[ASP.NET/IIS] DotNetSpider MVM Dotnet Galaxy

#675337 Author:

Siva Prasad Member Level: Gold Member Rank: 60 Date: 13/Jun/2012 Rating: 2 out of 5

Points: 2


      protected void Button1_Click1(object sender, EventArgs e)
        {
            string strNo = "786";
            Response.Redirect("Siva.aspx?strId=" + strNo);
        }

        protected void lnkbtn_Click1(object sender, EventArgs e)
        {
            string strNum = "555";
            Response.Redirect("Siva.aspx?strId=" + strNum);
        }



   public partial class Siva : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            this.txtBox1.Text = Request.QueryString["strId"];
        }
    }

#675371 Author: Ravindran Member Level: Diamond Member Rank: 3 Date: 13/Jun/2012 Rating: Points: 3
Hi, this error is due to come when the query string value is null try like this to avoid error `string qrystringval; try { qrystringval = Request.QueryString["qrystringname"]; } catch(Exception ex) { }` In the above if query string come in the url then assign it in variable otherwise not and also error not come Regards N.Ravindran Your Hard work never fails

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