how to use the query string values with in single page?

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hai,

i am passing the query string value in the same page..the following is the code i used but i am getting object instance reference set to null

<pre>

if (Request.QueryString["product_type"].ToString()== null)
{
if (Request.QueryString["product_type"].ToString() == String.Empty)
{
this.product_type = "Acer";
}
}
else
{
this.product_type = Request.QueryString["product_type"].ToString();
}
DisplayContents();</pre>

Posted 21-Jul-11 5:07am

Iam Velu

Updated 21-Jul-11 5:09am

Uday P.Singh

v2

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Uday P.Singh 21-Jul-11 11:14am

why are you doing so? when you can use view state

2 solutions

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fcronin · Answer 1 · 2011-07-21T06:20:00

Solution 1

if (Request.QueryString["product_type"] != null)
{
   this.product_type = Request.QueryString["product_type"];
}
else
{
   this.product_type = "Acer";
}

Posted 21-Jul-11 6:20am

fcronin

DominicZA · Answer 2 · 2011-07-21T06:59:00

Create a protected property (protected, just in case you need to reference it from the page), and use that to get your product type.

protected string _productType
{
get
{
if (!String.IsNullOrEmpty(Request.QueryString["product_type"])
    return Request.QueryString["product_type"]
else
    return "Acer";
}
}

Now just reference that where ever you need it. Remember, Request.QueryString returns a string, so you dont need to cast it to a string!