i m new in asp.net. i want 2 use query string but there is null refrence exception..plzzz tell me how it can be solved

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here is my code behind page

C#

protected void login_Click(object sender, EventArgs e)
  {
      Response.Redirect("Default2.aspx?user_name=" + TextBox1.Text + "");
  }

C#

protected void Page_Load(object sender, EventArgs e)
{
   //TextBox1.Text = Request.QueryString["username"];
    if (Request.QueryString["user_name"] == null)
    {
        Label1.Text = "querystring not found";
    }
    else
    {
        Label1.Text = Request.QueryString["username"].ToString();//here is null refrence exception
    }
}

Posted 9-Sep-12 22:49pm

Rashid Choudhary

Updated 9-Sep-12 22:50pm

v2

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3 solutions

Solution 1

Try this,

C#

protected void login_Click(object sender, EventArgs e)
  {
      Response.Redirect("Default2.aspx?user_name=" + TextBox1.Text + "",false);
  }

Posted 9-Sep-12 22:55pm

Rockstar_

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Sunil Kumar Pandab · Accepted Answer · 2012-09-09T22:55:00

Solution 2

Your query string names are different :-

your code should be like this:-

Label1.Text = Request.QueryString["user_name"].ToString();//here is null re

instead of this one what u have used in your code :-
Label1.Text = Request.QueryString["username"].ToString();//here is null refrence

so use 1st one. ( Request.QueryString["user_name"].ToString() )

Posted 9-Sep-12 22:55pm

Sunil Kumar Pandab

Comments

Rashid Choudhary 10-Sep-12 4:58am

thanxxx sir

Sunil Kumar Pandab 10-Sep-12 5:04am

most welcome dear

Sunil Kumar Pandab 10-Sep-12 5:06am

I gave you solution and you down voted my answer

Rashid Choudhary 10-Sep-12 7:02am

okkkkkkkkk

_Amy · Accepted Answer · 2012-09-09T23:00:00

Try this:
1st Page:

C#

protected void login_Click(object sender, EventArgs e)
{
      Response.Redirect("Default2.aspx?user_name='" + TextBox1.Text + "'");
}

2nd Page:

C#

protected void Page_Load(object sender, EventArgs e)
{
   //TextBox1.Text = Request.QueryString["username"];
    if (Request.QueryString["user_name"] == null)
    {
        Label1.Text = "querystring not found";
    }
    else
    {
        Label1.Text = Request.QueryString["user_name"].ToString();//_ was missing
    }
}

--Amit