Get part of a string

use,
Request.QueryString["fn"].ToString();

sorry, I forgot, the value is stored in the db, so I cant do a QueryString, have to use some logic

This can aid you..,

string fileName = Request.QueryString["fn"].ToString();

try this
string file = "";

if (Request.QueryString["fn"] != null){
  file = Request.QueryString["fn"].ToString();
}
To prevent error when QueryString do not passed

try

substring(str,st.indexOf('&fn=')+1,st.indexOf('&')-st.indexOf('&fn=')+1)

You can get the value from the URL, only through QueryString. else you can pass value between pages by Session. But the value won't be visible in URL in this case..

string[] strarray="http://testing.com/testing/file.aspx?id=1&fn=docfile.doc&ll=333".Split("&");
foreach (string stritem in strarray)
{
if(stritem.StartsWith("fn=")
{
stritem=stritem.Substring(3,stritem.Lenght-3);
break;
}
}

result is stritem

reza_rad

What happens if it was ?fn=

you code wouldnt work would it?

Thanks

and also, the extension name could be myfile.aasdsddd

So I think your code would not work

just you need to change first line,
try this now:

string[] strarray = "http://testing.com/testing/file.aspx?id=1&fn=docfile.doc&ll=333".Split(new string[]{"&","?"},StringSplitOptions.None);
            string strresult = string.Empty;
            foreach (string stritem in strarray)
            {
                if (stritem.StartsWith("fn="))
                {
                    strresult = stritem.Substring(3, stritem.Length - 3);
                    break;
                }
            }

Select allOpen in new window

in previous code strresult is the result you want, just test it

This will find whatever occurs between "fn=" and "&" 
maybe fn=anyfile.doc was the last thing in querystring. so there will be no ending "&" !

thankyou guys for helping me!! really kind of you

reza_rad is correct, change the regular expression in my previous code snippet to:

.*fn=(.*\..*)(&.*|\s$)

To find everything between "fn=" and either "&" or the end of the string.

did you test @tgerbert 's code? there is a bug in this code which i concern about! if your fn= ... text ends with nothing this code will return nothing. this was not correct, but you select it as assisted solution!
by the way glad to solve at all
be happy

@tgerbert:
that's right now :-)
regards,

sorry man, I hope its ok?

It's OK.
no problem:-)