How to improve this code using c# [duplicate]

Question

Possible Duplicate:
Is there a simpler way to do this if statement in C#

I have this code:

while ((txtSource.Text[startPos].ToString() == " ") || 
       (txtSource.Text[startPos].ToString() == ",") || 
       (txtSource.Text[startPos].ToString() == ".")))
        {
            // do something
        }

is there any way to do the above like for instance:

while (!txtSource.Text[startPos].ToString() in (" ",",","."))

Answer 1

while ((new char[] {' ', ',', '.'}).Contains(txtSource.Text[startPos]))