c# winapp crystal Report Viewer ไม่โชว์ค่าที่เราเรียกอ่ะคับ แต่เรียกขึ้น datagridview ได้คับ ช่วยดูให้หน่อยคับ ผมผิดตรงไหน

private void crystalReportViewer1_Load(object sender, EventArgs e)
        {
            string strConn;
            strConn = DBconn.Conn;
            Conn = new SqlConnection();
            if (Conn.State == ConnectionState.Open)
            {
                Conn.Close();
            }
            Conn.ConnectionString = strConn;
            Conn.Open();

            sb = new StringBuilder();
            sb.Append("SELECT Sumsalary.SalaryID,Sumsalary.HID,Human.FullName,WorkType.WorkTypename");
            sb.Append(" FROM Sumsalary,Human,WorkType");
            sb.Append(" WHERE (Sumsalary.HID=@HID)");
            sb.Append(" AND Sumsalary.HID = Human.HID");
            sb.Append(" AND Human.WID = WorkType.WID");
            string sqlSearch;
            sqlSearch = sb.ToString();

            com = new SqlCommand();
            com.CommandText = sqlSearch;
            com.CommandType = CommandType.Text;
            com.Connection = Conn;
            com.Parameters.Clear();
            com.Parameters.Add("@HID", SqlDbType.NVarChar).Value = DBconn.SHID;
            dr = com.ExecuteReader();
            if (dr.HasRows)
            {
                DataTable dtHuman = new DataTable();
                dtHuman.Load(dr);

                dataGridView1.DataSource = dtHuman;

                rptSalary salary = new rptSalary();
                salary.SetDataSource(dtHuman);
                crystalReportViewer1.ReportSource = salary;
                crystalReportViewer1.Zoom(50);
            }
     }