Need to know the "using Directive" for keyword coloumn

[VCVCVC]

hi ,
I have piece of code like this in C#.
[B]
start = result.IndexOf("<" + key + ">",0) + 2 + column.Length;

when i compile i get the error stating that undeclared,and the compiler generates a message that may "Are you missing a using Directive"?
but i dont know how to search for that particular using directive as i am very new to C# and dont know the procedures.Pls help to solve this problem and teach me how to find the using directives for particular keywords.
thanks in advance.

[Truschkat]

Hi,

can you post the complete compiler message?