How to compare alphanumeric value in c#?

Good Morning,

I develop a code to get numbers as input from word file and compare it with the contents. It works properly

Here is the code with conditions

strFilterWord = 

strWord.Replace ("(", string.Empty).Replace(')', ' ').Replace('.', ' ').Replace(';', ' ').

                                   Replace(':', ' ').Trim();if (strFilterWord.Length == 4)

                                               if (Convert.ToInt32(strFilterWord) > 1900 

                                                      && Convert.ToInt32(strFilterWord) < 2012)

Note:
1) For the above code i use the condition: Input value is occur in four digits and it is between 1900 to 2012. (Year)
2) In a paragraph the year information is occur only once.


Similarly i need to compare the alphanumeric value [Ex: 2012a].


Regards,

Deepakkumar G.

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