Check out example codes for "querstring fromat asp.net c#". It will help you in understanding the concepts better.

Code Example 1

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);
}

Code Example 2

[TestMethod]
public void QueryStringTest()
{
    string str = "http://mysite.com/page1?id=3123&format=json&action=edit&text=It's%20a%20brave%20new%20world!";

    var query = new UrlEncodingParser(str);

    Assert.IsTrue(query["id"] == "3123");
    Assert.IsTrue(query["format"] == "json","wrong format " + query["format"]);
    Assert.IsTrue(query["action"] == "edit");

    Console.WriteLine(query["text"]);
    // It's a brave new world!

    query["id"] = "4123";
    query["format"] = "xml"; 
    query["name"] = "<< It's a brave new world!";

    var url = query.ToString();

    Console.WriteLine(url);
    //http://mysite.com/page1?id=4123&format=xml&action=edit&
    //text=It's%20a%20brave%20new%20world!&name=%3C%3C%20It's%20a%20brave%20new%20world!
}

Code Example 3

public partial class QueryStringValuesTransfer : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string id1 = Server.UrlDecode(Request.QueryString["id"]);
        string name1 = Server.UrlDecode(Request.QueryString["name"]);
        Response.Write(id1 + name1);

    }

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