If & Equals

[carstenht]

Can any1 tell me why the code inside the if statement isnt executed??
input = 2+2 in this case

while (curPos < length)
            {

                if (input[curPos].Equals("0") || input[curPos].Equals("1") || input[curPos].Equals("2") || input[curPos].Equals("3") || input[curPos].Equals("4") || input[curPos].Equals("5") || input[curPos].Equals("6") || input[curPos].Equals("7") || input[curPos].Equals("8") || input[curPos].Equals("9"))
                {
                    System.Console.Write("TEST");

                    tmpexp += input[curPos];
                    

                }
                

                temp += Convert.ToInt32(tmpexp);


                
               
            
                curPos++;



            }

I know the problems lies in the use of Equals, but cant isolate the problem..