used Is Letter or Digit while building string.

Just use String.Replace to get rid of the carraige return. Furthermore,
if there is only ONE carraige return  at the end, then you can use the
Left method of the string  class to get the n-1 leftmost characters of
the string, where n is the length of the string.

I have 2 strings A & B, is there a function that can reply me in true or false that string  A is existing is string B as substring?

Yes, have a look at the IndexOf method:
msdn.microsoft.com/.../...ingclassindexoftopic.asp

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MyString.Remove(MyString.Length-2, MyString.Length)

or near enough .... is what i'd use

I have attached two text files list 1 & list 2.

List 1 has been obtained directly form a Router.

List 2 is from a table in a db.

I have to check that every username in list which is from database is present in router or not, and thers is a tricky part that a user in router list can be without @ where as in table it is with @domain and vice versa.

I have these two lists in two seperate list boxes and as before thought sorting them would be a piece ofcake as I have had hadled lists far complex than tshi involving several types of string  manipulations.

In thsi particular case I tried:
Idex of, beginswith, and eventually to wrote a routine but I couldn't get the right result, as usually missing something. If any one can help me in thsi regard, please..

I am onwith having forms in web pages, is there a shortcut to have my alraedy developed forms to be coverted to controls, so that I don't have to develop them again in the windows control library?

How would I do this ...

well I'd forget about listboxes and their related  functions.
Just do it from files.


read in a line, chop it about @ and save it in a 2d arraylist (or array).

then you can use super fast code to loop and compere.

I don't really understand your criteria for what is or isn't allowed .... if the domain isn't important then just chop around @ and save the first half.

The just loop through one array checking if it exists in the other.

Or there are bubble sorts and so forth available - or there are array sorts available withinn .NET that can get rid of duplicate and so forth.

Should be pretty easy. Enjoy the exploration.

To convert a form to a control just change it to a UserControl and get rid of main, and autoscalebasesize and if you have any menus change them to context menus.
Set project to compile as as dll and voila ! Bob your uncle ! (British expresssion, soz)