Prevent textbox reset while still generating qr code asp.net

I'm creating an asp.net mvc app that generates a qr code on a button click when the user inputs a string. The problem is the user input clears every time I press the button. I've tried adding onsubmit="return false" but then the qr code doesn't get generated.

C# Code:          public ActionResult Index(string qrcode)          {              using (MemoryStream ms = new MemoryStream())              {                  QRCodeGenerator qrGenerator = new QRCodeGenerator();                  QRCodeData qrCodeData = qrGenerator.CreateQrCode(qrcode, QRCodeGenerator.ECCLevel.Q);                  QRCode qrCode = new QRCode(qrCodeData);                  using (Bitmap bitMap = qrCode.GetGraphic(20))                  {                      bitMap.Save(ms, ImageFormat.Png);                      ViewBag.QRCodeImage = "data:image/png;base64," + Convert.ToBase64String(ms.ToArray());                  }              }                return View();          }  HTML:                  <form asp-action="Index" asp-controller="Home">          Site ID:<input type="text" name="qrcode" id="site">          Device ID:<input type="text" name="device">          Validation ID:<input id="year">          <input type="submit" value="Generate" id="subButton"/>  

How can I make it so the user input is still there after the button click but the qr code is still generated?

https://stackoverflow.com/questions/66603550/prevent-textbox-reset-while-still-generating-qr-code-asp-net March 13, 2021 at 12:21AM