Regular Experssions in C#

To use regular experssions in C# use System.Text.RegularExpressions class. It provides a Regex class, which objects represent your expressions. You can later use IsMatch(String textToCheck) method of this class to see wheter the textToCheck maches your expression:

<br />using System.Text.RegularExpressions;<br />using System;<br /><br />public bool IsAlphaNumeric(String textToCheck)<br />{<br /> Regex objAlphaNumericPattern=new Regex("[^a-zA-Z0-9]");<br /> return !objAlphaNumericPattern.IsMatch(textToCheck);<br />}<br />