How to write regular expression in C# to check anything entered in text box apart from max of two digits before decimal ,followed by a decimal point and one digit after decimal(i.e how to use...

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C#

Hi,
I have an text box which accepts hours. It will accept only numeric and decimal values.
And it will allow max of two digits before the decimal point, followed by a decimal point and then only single decimal point.

so now using the below regular expression:

Regex expressionToValidate_String_Structure = new Regex("^\\d{1,2}([.]\\d{1})$");


so now how can i use negation in the above expression to check anything entered in the text box apart from the above regular expression format?


please help me.. i want a solution in C#