Avoiding crystal report user name and password

Am using the code below to generate my report and it works alright. but the report keeps asking for username and password. how do i avoid this

private void btnshow_Click(object sender, EventArgs e)
        {
           
            SqlConnection conn = new SqlConnection(ConfigurationSettings.AppSettings["ConnectionString"]);
            conn.ConnectionString = "Data Source=USER-PC;Initial Catalog=MUCGPROJECT;User ID=sa;Password=mike";
          

            SqlCommand cmd = new SqlCommand(string.Format("SELECT * FROM tblCollectorsRegistration WHERE      
            Collectorid='{0}'", this.txtCollectorid.Text), conn);

                conn.Open();
                SqlDataReader dr = cmd.ExecuteReader();
               

                if (dr.HasRows)
                {
                    conn.Close();

                    DataTable tbl = new DataTable();

                    conn.Open();

                    SqlDataAdapter adp = new SqlDataAdapter("SELECT Collectorid, Title, Surname, Firstname,
                    Middlename, Gender, Dateofbirth, Nationality, Religion, Maritalstatus, Spousename,
                    Telephone, Postaladdress, Residentialaddress, Hometownaddress from
                    tblCollectorsRegistration WHERE Collectorid = '" + this.txtCollectorid.Text + "'", conn);
                    adp.Fill(tbl);

                    rptCollectorindividual objRpt = new rptCollectorindividual();
                    objRpt.Database.Tables[0].SetDataSource(tbl);
                    crystalReportViewer1.ReportSource = objRpt;
                    crystalReportViewer1.Refresh();
                }
                else
                {
                    // Id already present
                    MessageBox.Show("The Collector ID does not Exist");
                    return;
                  
                }
        }