Since kartlogin.aspx seems to be a user-login page, then are you interested in passing userID + password to another page?
Still not sure what you are trying to achieve, but if its only passing data from one page to another, there are many ways, here are some quick ones you can try:
On kartlogin.aspx:
1. Query String Method Send/Post Value:
string name="xyz";
Response.Redirect("Page2.aspx?name= "+name);
2. Cookie Method Send/Post Value:
HttpCookie myCookie = new HttpCookie("name");
myCookie.Value="xyz";
Response.Cookies.Add(myCookie);
3. Session Method Save Value:
Session["name"] = "xyz";
On Page2.aspx:
1. Query String Method Get Value:
string name = Response.QueryString.GetValue(" name ");
Response.Write(name);
2. Cookie Method Get Value:
string name = Request.Cookies('name');
Response.Write(name);
3. Session Method Get Value:
string name = Session["name"].ToString();
Response.Write(name);
You should take a look at: