asp.net 2010 validate date

Question

In a C# 2010 web form application I would like to know how to setup user server side validators to check the format of a date in mm/dd/yyy format. Basically this would be like a regular expression custom validator compare validator. I basically need to validate the mm/dd/yyyy format includes for month date year. I also am required to make certain the user enters the date with the '/'. enter. Can you tell me how to accomplish this goal?

Deepak Verma · Answer

please refer : Link 1 and Link 2

Deepak Verma · Answer

Hi Actually both of above solutions will validate 02/29/2011 or 02/30/2012 as correct while the given dates are invalid. The solution is here: ASPX CODE: asp : TextBox ID =TextBox1 runat =server ValidationGroup =DateValidation /> asp : RegularExpressionValidator ID =RegularExpressionValidator runat =server ErrorMessage = Date not formatted well! Display =Dynamic ControlToValidate =TextBox1 ValidationExpression =\d{2}\/\d{2}\/\d{4} ForeColor =Red ValidationGroup =DateValidation> asp : RegularExpressionValidator > asp : CustomValidator ID =CustomValidator1 runat =server ControlToValidate =TextBox1 ErrorMessage = Date not formatted well! OnServerValidate =CustomValidator_OnServerValidate ForeColor =Red Display =Dynamic ValidationGroup =DateValidation /> asp : Button ID =Button1 runat =server Text =click ValidationGroup =DateValidation /> C# CODE: protected void CustomValidator_OnServerValidate( object sender ServerValidateEventArgs args) { try { DateTime .ParseExact(args.Value MM/dd/yyyy  null ); args.IsValid = true ; } catch { args.IsValid = false ; } }

scampercat · Answer

Can you tell me what the [- /.] means?

scampercat · Answer

I have the following addtional questions to ask about your answer: 1. What does \d{2} mean? two occurences of a number? 2. What does \/ mean? This means to use / as a real value and not use it as a regular expression meaning?

Deepak Verma · Answer

Yes Jignesh you're right. RegularExpressionValidator respond when user entered invalid format one step earlier. And CustomValidator respond when user click on Button.

Jignesh Trivedi · Answer

Hi deepak Yes... so why we put two validator RegularExpressionValidator and CustomValidator on single control we can acheive this using single CustomValidator . I think if i Enter any unvalid date like 45/66/2012 it is not work @ client side. it work when page validate method is called. correct me if i am wrong.

Deepak Verma · Answer

Hi Jignesh I've tested it! Just working great... The is behind the scene...

Jignesh Trivedi · Answer

hi Dipak i have tried your solution and enter data like 45/66/2012 so it allow me to enter. Regex.IsMatch(45/66/2012 @^\d{2}\/\d{2}\/\d{4}$ ) is return true. we required date format mm/dd/yyyy so first 2 digit must be lessthan or equal to 12. thx.

Jignesh Trivedi · Answer

hi you can use regular expression like ^(0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])[- /.](19|20)\d\d$ it validate the date. valid : 12/12/2000 05/25/2012 invalid : 23/12/2005 hope this will help you.

Deepak Verma · Answer

Hi you can use this RegularExpressionValidator : asp : RegularExpressionValidator ID =RegularExpressionValidator1 runat =server ErrorMessage = Date not formatted well! Display =Static ControlToValidate =TextBox1 ValidationExpression =\d{2}\/\d{2}\/\d{4} ForeColor =Red > asp : RegularExpressionValidator >