How to keep url same after page postback with error in MVC

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MVC

Hello Developers,

I am working on the page in MVC 5 where page is submitting the data.
I have a url with querystring on my page.

My scenario is when submitting data is successful then redirect to another page
and when error occurs then remain on same page with previously filled data and show the error.

I have achieved the first one and also half of second scenario but when i post data and error
occurs - my url losts the querystring.


eg. My actual url is -> www.example.com/register.htm?id=1&val=abc&ref=xyz

when i post data and error occurs it becomes - www.example.com/register.htm

I want to keep the url same when error occurs so user can reload the page.

Please help me guys.

Thanks in advance.