Below code is used to apply force validation on server side.
First use anyone from below function:
Page_ClientValidate("ValidationGroupName") to validate particular group
or
Page_ClientValidate() to check all validator
or
Page.Validate()
Then you can just make use of this If condition
First use anyone from below function:
Page_ClientValidate("ValidationGroupName") to validate particular group
or
Page_ClientValidate() to check all validator
or
Page.Validate()
Then you can just make use of this If condition
if (PageIsValid) { //postback only occurs when ALL validations pass.
// You can write your further code here.}