Check existance of a querystring variable

[Imran Aziz]

Hello All,
I have ASP.net , C# pages checking for query string variables, the old
ASP has a count property that one could check for each key/value pair to
determine if it is available in the query string or not, but ASP.net does
not have that for each key/value, instead there is a count for all items in
the query string.

Say if I have a query string variable called key1=value1 how do I check if
key1 was set or not?
Thanks a lot in advance.

Imran.

[Grant Merwitz]

I do it like this

if(Request.QueryString["key1"] != "" && Request.QueryString["key1"] != null)
{
//Querystring exists
}

And to make this less painful, i also create a static method that i call for
this.

So:

public class Common
{
public static bool HasValue(object o)
{
if (o == null)
{
return false;
}

if (o == System.DBNull.Value)
{
return false;
}

if (o is String)
{
if (((String) o).Trim() == String.Empty)
{
return false;
}
}

return true;
}
}


"Imran Aziz" <im***@tb2.net> wrote in message
news:eQ**************@TK2MSFTNGP14.phx.gbl...

Hello All,
I have ASP.net , C# pages checking for query string variables, the old
ASP has a count property that one could check for each key/value pair to
determine if it is available in the query string or not, but ASP.net does
not have that for each key/value, instead there is a count for all items
in the query string.

Say if I have a query string variable called key1=value1 how do I check if
key1 was set or not?
Thanks a lot in advance.

Imran.

[Imran Aziz]

Wonderful, thanks a lot Grant.
Imran
"Grant Merwitz" <gr***@workshare.com> wrote in message
news:uR**************@TK2MSFTNGP14.phx.gbl...

I do it like this

if(Request.QueryString["key1"] != "" && Request.QueryString["key1"] !=
null)
{
//Querystring exists
}

And to make this less painful, i also create a static method that i call
for this.

So:

public class Common
{
public static bool HasValue(object o)
{
if (o == null)
{
return false;
}

if (o == System.DBNull.Value)
{
return false;
}

if (o is String)
{
if (((String) o).Trim() == String.Empty)
{
return false;
}
}

return true;
}
}


"Imran Aziz" <im***@tb2.net> wrote in message
news:eQ**************@TK2MSFTNGP14.phx.gbl...

Hello All,
I have ASP.net , C# pages checking for query string variables, the old
ASP has a count property that one could check for each key/value pair to
determine if it is available in the query string or not, but ASP.net does
not have that for each key/value, instead there is a count for all items
in the query string.

Say if I have a query string variable called key1=value1 how do I check
if key1 was set or not?
Thanks a lot in advance.

Imran.