How to pass datails in Asp.net using c# code

There are many ways to do that:

1. You can construct URL with required info passing as parameters before redirecting to specific page.

Ex:

string pageURL = "~/NewPage.aspx?DisplayMode=" + Server.UrlEncode("Edit") +
"&Param1=" + Server.UrlEncode(paramValue) +
"&Param2=" + Server.UrlEncode(paramValue);
Response.Redirect(pageURL , false);

2. If data is in bulk, you can use Session variable to store data in first page and can fetch in second page.

Ex:
//in page 1
Session["Page1Data"] = string data;

//in page 2
string strTemp = Session["Page1Data"]