C# code to check whether a string is numeric or not?

You can do like... string s = "sdf34"; Int32 a; if (Int32. TryParse(s, out a)) { // Value is numberic } else { //Not a valid number }.

You could use the int. TryParse method. Example: string s = ... int result; if (int.

TryParse(s, out result)) { // The string was a valid integer => use result here } else { // invalid integer } There are also the float. TryParse, double. TryParse and decimal.

TryParse methods for other numeric types than integers. But if this is for validation purposes you might also consider using the built-in Validation controls in ASP.NET. Here's an example.

1 That will only cover int though, there are lots of other numerics. – Jon Egerton May 26 '11 at 11:55 @Jon Then use Decimal. – vcsjones May 26 '11 at 11:59 1 @Jon Egerton, I've updated my answer to take your remark into account.

– Darin Dimitrov May 26 '11 at 12:01.

Yes there is: int. TryParse(...) check the out bool param.

Have a look at this question: C# equivalent of NaN or IsNumeric.

You can use built in methods Int. Parse or Double. Parse methods.

You can write the following function and call where ever necessary to check it. Public static bool IsNumber(String str) { try { Double. Parse(str); return true; } catch (Exception) { return false; } }.

1 Since 2005 (.NET 2.0) there are TryParse methods - don't use exceptions for normal program flow! – Lucero May 26 '11 at 12:02.

You can read this article Parse(int. Parse,double. Parse) methodes will throw an exception and if exception thrown that means string is not a number Here it is.

1 Since 2005 (.NET 2.0) there are TryParse methods - don't use exceptions for normal program flow! – Lucero May 26 '11 at 12:02 thats what already explained in the link article I shared anyways thanks – Devjosh May 26 '11 at 12:04 1 no matter what the article say, your answer says to use Parse and look for the exception. – Lucero May 26 '11 at 12:11 ok so what should be done – Devjosh May 26 '11 at 12:27 what do you mean, "what should be done"?

Use TryParse, not Parse, as already written in the initial comment I made! – Lucero May 26 '11 at 13:23.

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