I have a handful of ASP.NET Webforms I need to start converting to ASP.NET Core Razor pages.

Below I have an example on how one of these pages currently operates to give an idea of what I am working with, but I am unsure on where to even begin with converting this all to Razor pages. I am open to other solutions

HTML

<input type="search" class="form-control" placeholder="Enter Device Name or Number" id="searchval" />
<div class="input-group-append">
<button class="btn btn-primary" type="button" onclick="search()"></button>
<span id="number"></span>
<span id="name"></span>
<span id="model"></span>

JavaScript

function search() {
  var device = $('searchval').val();

  $.ajax({
     url: "postback.aspx",
     data: {
         ftn: 1, 
         val: device
     },
     success: function (data) {
       var splitdata = data.split(";");
       var number = $.trim(splitdata[0]);
       var name = $.trim(splitdata[1]);
       var model = $.trim(splitdata[2]);

       $("#number").text(number);
       $("#name").text(name);
       $("#model").text(model);
     }
  });
}

postback.aspx.cs C#

protected void Page_Load(object sender, EventArgs e)
{
    String Function = Request.QueryString["ftn"];

    switch (Function)
    {
       case "1":
         Search();
         break;

       default:
         break;
    }
}

public void Search()
{
   string value = Request.QueryString["val"];
   string sqlstring = /*connection string here*/;

   SqlConnection con = new SqlConnection(sqlstring);
   con.Open();

   string qry = /*stored procedure using value*/

   SqlCommand cmd = new SqlCommand(qry, con);

   using (SqlDataReader sdr = cmd.ExecuteReader())
   {
     while (sdr.Read())
     {
       string number = sdr.["devnumber"].ToString();
       string name = sdr.["devname"].ToString();
       string model = sdr.["devmodel"].ToString();

       Response.Write(number);
       Response.Write(";");
       Response.Write(name);
       Response.Write(";");
       Response.Write(model);
     }
   }
   con.Close();
}

I’m pretty new to ASP.NET Core Razor pages and have done the documented tutorial from Microsoft, but I am just struggling on how to apply that to converting this current app I am working with.