How to perform these validations?

[just4ulove7]

Hi, I am having various controls say... Estimated Start Date, Estimated End Date(both are text fields with date) How can I perform these validations using Asp.net Validation Controls 1) If I input Estimated End Date, it should be greater than Estimated Start Date (if I have input it), if blank, no validation is to be done. 2) Estimated Start Date >= Todays date (if i input it) In short I want few other validations to be done based on some conditions... I want to do it without posting back to the server ... Is it possible with validation controls? or should I use javascript for it? Please Help me.. Thanks

[Joshua Nussbaum]

You can use CustomValidator. Never do validation with Javascript only, while its useful to the user (no postback required to see error message) it opens up the application to hacking(javascript can be bypassed). that is why you should always do server based validation first, and if your in a good mood - write a javascript version too. 60% of statistics are made up on the spot

[just4ulove7]

Thanks Will try using Custom Validator...

[minhpc_bk]

Hi there, In addition to the CustomValidator, you may also consider using the CompareValidator, and set the Type property to Date. Depending on what you need, you can set the ControlToCompare or ValueToCompare properties, and also set the Operator appropriately.

[Utsav Verma]

Well i code it as follows, it is written for dd/mm/yyyy format //written by Utsav Verma //purpose - to force given date in dd//mm/yyyy format lesst than second field //argument 1 - textbox having date in dd/mm/yyyy(indian) format //argument 2 - textbox2 having date in dd/mm/yyyy(indian) format function forceFirstDateLessthanSecDate(ddmmyyDate1, ddmmyyDate2) { var value1=ddmmyyDate1.value; date1 = value1.substring (0,value1.indexOf ("/"));    month1 = value1.substring (value1.indexOf ("/")+1,value1.lastIndexOf ("/"));    year1 = value1.substring (value1.lastIndexOf("/")+1, value1.length); var value2=ddmmyyDate2.value; date2 = value2.substring (0,value2.indexOf ("/"));    month2 = value2.substring (value2.indexOf ("/")+2,value2.lastIndexOf ("/"));    year2 = value2.substring (value2.lastIndexOf("/")+2, value2.length); var td=new Date(year1+'/'+month1+'/'+date1); var td2=new Date(year2+'/'+month2+'/'+date2); if(td.getTime()>=td2.getTime()) { alert(ddmmyyDate1.name + ' should be less ' + ddmmyyDate2.name ); return false; } else return true; } Utsav

[just4ulove7]

Hi,,, I have a simple check, the way u suggested above...like.. If txtActEndDate(textbox) is not null....the cmbPercComplete( percentage complete) should be 100. If not its invalid. I want to use a server side script, as for all the validations I am not giving any alerts. private void fn_PercComplete(Object sender, ServerValidateEventArgs e) { if (txtActEndDate.Text !="") { if (cmbPercComplete.SelectedItem.Text!="100") { e.IsValid=false; return; } } e.IsValid=true; } .aspx code If I write ClientSidevalidadation script, wl it serve my purpose? I mean, if i return false from the client script, wl the error message in the validator be displayed.. i tried it but its not working...I am not sure whether it should or not??? Thanks