Below is the code snippet to send data from one page to another using QueryString.
//Code to send query strings FName and LName as part of the URL
protected void Page_Load(object sender, EventArgs e)
//Code to read Query String values
string FirstName = Request.QueryString["FName"];
string LastName = Request.QueryString["LName"];
Response.Write("Data from QueryStrings1.aspx : " + FirstName + ", " + LastName);