to validate for numbers and alphabets in c# asp.net2.0

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ASP.NET2

to validate for numbers and alphabets in c# asp.net2.0 in codebehind file,textbox should contain only numbers from 1-99 with % symbol along with some alphabets or numbers from 1-99 with % symbol with out alphabets if it contains only numbers or more 1-99 range error message in alert box should be thrown..please help me how to code in c#.net in code behind file using regular expression.