how to get data from quersy string code example

Example 1: javascript reading query parameter

// example url: https://mydomain.com/?fname=johnny&lname=depp
const urlParams = new URLSearchParams(window.location.search);
const firstName = urlParams.get('fname'); // johnny

Example 2: querstring fromat asp.net c#

protected void Page_Load(object sender, EventArgs e)
{


}
protected void Button1_Click(object sender, EventArgs e)
{
    string id = "1";
    string name = "aaaa";

    string url = string.Format("QueryStringValuesTransfer.aspx?{0}&{1}", Server.UrlEncode(id), Server.UrlEncode(name));


    Response.Redirect(url);
}