Problem with the crystal report prompting for username password and database name

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C#

ASP.NET

CrystalReports

i am just showing crystal report on my webpage using dataset. Crystal report is successfully displaying data in a crystal report. but the problem is that whenever i tried to print. or zoom the crystal report. its prompting that

The report you requested requires further information.

and ask me to give the fallowing informatoin

servername ,databasename , username and password.
Why is it doing that instead of printing or zooming . where is the problem

Here is the code logic. i am just displaying crystal report using dataset.

public partial class _Default : System.Web.UI.Page 
{
    SqlConnection sqlcon = new SqlConnection(ConfigurationManager.ConnectionStrings["connectionstring"].ConnectionString);
    SqlCommand sqlcmd;
    SqlDataAdapter da;
    DataTable dt = new DataTable();
   string sid, query;
   protected void Page_Load(object sender, EventArgs e)
   {
       if (!Page.IsPostBack)
       {
           sid = Request.QueryString["sid"];
           try
           {
               sqlcon.Open();
               //Check whether query string have value or not if not have value then select all record in below query otherwise select particular record with help of where condition
               if (sid == "" || sid == null)
               {
                   query = "select * from student";
               }
               else
               {
                   query = "select * from student where sid='" + sid + "'";
               }
               sqlcmd = new SqlCommand(query, sqlcon);
               da = new SqlDataAdapter(sqlcmd);
               dt.Clear();
               da.Fill(dt);
               if (dt.Rows.Count > 0)
               {
                   ReportDocument RptDoc = new ReportDocument();

                   RptDoc.Load(Server.MapPath("~/CrystalReport.rpt"));
                   RptDoc.SetDataSource(dt);

                   CrystalReportViewer1.ReportSource = RptDoc;
                   CrystalReportViewer1.DataBind();
               }
           }
           catch (Exception ex)
           {
               Response.Write(ex.ToString());
           }
           finally
           {
               sqlcon.Close();
           }
       }
   }
}