How to identify that querystring name contain space?

Question

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Ex: sitename/sample.aspx?username=''&userid=''

cs file

string Username = "";
if (Request.QueryString["username"] != null)      
{
    Username = Request.QueryString["username"].ToString();
}
string userid = "";
if (Request.QueryString["userid"] != null)      
{
   userid = Request.QueryString["userid"].ToString();
}

If I use/pass 'username' or 'Username',both get check it is not case sensative.But if user pass like following

Ex: sitename/sample.aspx?username =''&userid=''

I want to restict it.How I check that querystring name contain space?

What I have tried:

string userid = "";
if (Request.QueryString["userid"] != null)      
{
   userid = Request.QueryString["userid"].ToString();
}

Posted 5-Jan-17 1:14am

Member 11589429

Updated 5-Jan-17 23:38pm

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2 solutions

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Peter Leow · Answer 1 · 2017-01-05T01:25:00

Solution 1

If you are trying to catch any space-only query string, you can always trim the query string to get rid of leading and trailing spaces, then check for its length after trimming, e.g.

string userid = " ";
if(userid.Trim().Length == 0){
     Console.WriteLine("userid is empty");
}

Posted 5-Jan-17 1:25am

Peter Leow

Updated 5-Jan-17 1:26am

v2

avinashkumar0509 · Answer 2 · 2017-01-05T23:38:00

Solution 2

Might help......... Check with

C#

string username="";
if(!String.IsNullOrEmpty(Request.QueryString["username"]))
{
  username=Request.QueryString["username"];
}
else
{
  Response.Write("Query String is null");
}

Posted 5-Jan-17 23:38pm

avinashkumar0509

Updated 5-Jan-17 23:39pm

v2